MATH 8 CATALINA FOOTHILLS SCHOOL DISTRICT

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1 MATH 8 CATALINA FOOTHILLS SCHOOL DISTRICT Overarching Understandings for the Course: Students will understand Number Systems, Percents, Expressions, Equations, and Inequalities, Exponent Rules, Functions, Systems of Equations, and Statistics. Number Systems: (No Calculators and Show All Work.) 1.) Complete the diagram by filling in the following words in the appropriate spot: Natural Integer Real Irrational Rational Whole 2.) Complete the chart. Make a check in the box if the number is a member of the set described, leave it blank if it is not. Natural Whole Integer Rational Irrational Real ) Explain why all integers are also rational numbers. Use a negative integer, zero, and a positive integer as examples to justify your response. 4.) Give the name of the set of real numbers that is not rational. Describe the two characteristics of such numbers. Then provide two numerical examples.

2 5.) 130 is between which two consecutive 6.) Put a point on the number line for an integers? approximate value of 15. Simplify: 7.) ) ) (5) 3 10.) Find the side length of a square with an area of 169 square meters. Label your answer. Work: Answer: For Problems 11 14: Show your work to estimate (approximate) the square roots of the following numbers. Then plot the points on the given line to show their relative positions. 11.) 5 12.) ) 8 14.) For Problems 15 and 16: Calculate the approximate square root (showing all your work): 15.) Estimate 19 to the nearest hundredth. Show your iterative process. Work: Answer: 16.) Estimate 50 to the nearest tenth. Show your iterative process. Work: Answer:

3 For Problems 17 and 18: Solve the following equations: 17.) y 2 = ) t 2 = ) The period of a pendulum is the time that it takes to swing from one side to the other and back. A pendulum s period P (in seconds) and its length l (in feet) are related by the equation P =1.1 l. If a pendulum has a length of 42 feet, what is the approximate time of its period? Answer: 20.) One attraction at an amusement park ride is a free-fall drop ride. The equation d =16t 2 can be used to determine the time, t, (in seconds) that it takes a dropped object to fall a distance of d feet. How far do you fall if the time of free-fall is 5 2 seconds? Answer: 21.) Convert each of the following into their equivalent decimal form: a.) 5 8 = b.) 2 3 = 22.) Express each of the following decimal numbers as the ratio of two integers in lowest terms. a.) = b.) 0.4 = c.) 0.24 =

4 MATH 8 CATALINA FOOTHILLS SCHOOL DISTRICT Overarching Understandings for the Course: Students will understand Number Systems, Percents, Expressions, Equations, and Inequalities, Exponent Rules, Functions, Systems of Equations, and Statistics. Percents: (No Calculators and Show All Work.) For Problems 1 4, write the equivalent fraction (simplified), decimal, and/or percent. Fraction Decimal Percent 1.) 0.68% 2.) ) ) 1 6 For Problems 5 7, use a proportion to solve the percent problem. 5.) What percent of 125 is 15? 6.) What is 50% of 78? 7.) 15 is 20% of what number? In problems 9-11, use an equation to solve the percent problem. 8.) What percent of 78 is 26? 9.) What is 7% of $56.00? 10.) 23 is 1/6 of what number?

5 Show all work to show how you solved the following problems: 11.) From 1980 to 1990, the population of Cook County, Illinois increased from 5,000,000 to 5,300,000. By what percent did the population change from 1980 to 1990? Show all work! 12.) We are currently feeding our country on 920 million acres of farmland. This is about 40% of the nation s total land mass. What is the total number of acres of land in the United States? 13.) The average ant weighs 0.3 grams and can carry up to 15 grams. What percent of its own body weight can the average ant carry? 14.) Explain (in words), why the percent change from 1 to 2 is not equal to the percent change from 2 to 1.

6 15.) Use the given information to find the total cost. Round up to the nearest cent. Food bill: $65 Sales tax: 8% Tip: 20% (on food bill only) 16.) a.) A salesperson makes $11.00/hr. After a training period, the worker will receive a 5% increase on his/her hourly wage. If the person then works 35 hrs per week, how much should the worker be paid per week? b.) If the government withholds 20% of the paycheck for tax purposes, how much should the worker actually receive in their paycheck? 17.) The iphone6s Plus is on sale for 15% off the original price. The sale price is $901. What was the original price? (Hint: The sale price is always a part of the whole). 18.) Suppose you deposit $600 into an account that earns simple annual interest of 5%. After 2 years, what is the account balance?

7 MATH 8 CATALINA FOOTHILLS SCHOOL DISTRICT Overarching Understandings for the Course: Students will understand Number Systems, Percents, Expressions, Equations, and Inequalities, Exponent Rules, Functions, Systems of Equations, and Statistics. Expressions, Equations, and Inequalities: (No Calculators and Show All Work.) For Problems 1 9, simplify the following expressions: 1.) 84 [ ( 19 16) 2 ] 2.) ) ( 8 4) 2 + ( ) 4.) 3 ( ) ) ( ) ) ) ( 4 2) 2 8.) (4 2 2 ) 9.) ( 7) ) Find the length of each side of a square whose area is 81 cm 2. Answer: 11.) Find the perimeter of the square whose area is 144 in 2. Answer:

8 For Problems 12 17, solve each equation for the variable x, showing all work: 12.) 3x 9 = 6 13.) 5 6x = ) 19 = 7 3x 15.) 1 = x 16.) x = ) 3 5 x 5 = ) Solve; then list the property you used. Then check your solution. 19.) Solve; then list the property you used. Then check your solution. 3x +15 = 48 Property 16 = 2 x 24 Property 5 Check: Check: For Problems 20 25, solve each inequality, then graph its solution set on the number line provided.

9 20.) 8 + x < ) x 5 < 2 Answer: Answer: ) x ) 2 > 8x 4 Answer Answer ) 20 5x >10 25.) 4 + x 5 < 3 Answer Answer 0 0 MATH 8

10 CATALINA FOOTHILLS SCHOOL DISTRICT Overarching Understandings for the Course: Students will understand Number Systems, Percents, Expressions, Equations, and Inequalities, Exponent Rules, Functions, Systems of Equations, and Statistics. Exponent Rules & Scientific Notation: (No Calculators and Show All Work.) For Problems 1 8, simplify. Write your answer using exponents ) ) 2 3.) 2 2w2 5w 4.) 15c ) 2mn 3c ( ) 6.) ( ) 3m4 n 2 30x 11 y 13 12x 6 y 9 7.) 3x 3 4 x 4 36x 2 8.) 5d 3 20d 4 25d 5 For Problems 9 and 10, find the area of each of the following geometric figures: 9.) A rectangle with sides of x 2 inches and x 5 inches 10.) A right triangle with a base of 4x cm and height of 5x cm For Problems 11 20, simplify. Write your answer using positive exponents only. 11.) ) x 2 y 8 13.) ) 4y 3 15.) 25 0 p 3 16.) 1 8 x5 y 3 8x 4 y 5 ( ) 17.) 12r 4 4r 6 18.) 9g 3 ( 36g 19.) 4x 4 )( 3x 10 ) 20.) 5 4x 8 ( 3r 5 )( 5rp 4 ) 4 p 4 21.) Explain why 2 0 =1.

11 For Problems 22 25, write each number in scientific notation. 22.) 95, ) ) ) 9,850,000,000 For Problems 26 29, write each number in standard notation. 26.) ) ) ) ) Multiply ( )( ). Write your answer in scientific notation. Answer: 31.) Divide ( ). Write your answer in scientific notation ( ) Answer:

12 MATH 8 CATALINA FOOTHILLS SCHOOL DISTRICT Overarching Understandings for the Course: Students will understand Number Systems, Percents, Expressions, Equations, and Inequalities, Exponent Rules, Functions, Systems of Equations, and Statistics. Functions: (No Calculators and Show All Work.) 1.) What is the slope of the line graphed at the right? a.) m = 2 b.) m = 1 2 c.) m = 2 4 d.) m = ) What is the slope in the equation y = 2x 5? a.) m = 2 b.) m = 2 c.) m = 5 d.) m = 5 3.) What is the slope of the line passing through the points ( 3, 0) and ( 2, 15)? (Show all work!) a.) m = 1/3 b.) m = 3 c.) m = 5 d.) m = 15 4.) What is the slope a line passing through the points in the table at the right? a.) m = 2 b.) m = 1 2 x y c.) m = 2 d.) m = ) What is the slope of the line graphed at the right? a.) m = 3 2 b.) m = 0 c.) m = 2 3 d.) m = 3 2

13 6.) What is the slope of the line passing through the points ( 4, 2) and ( 2, 7)? a.) m = 5 2 b.) m = 2 5 c.) m = 5 2 d.) m = ) In the situation described below, identify the slope: At 2:00 pm., John stands at the top of a 200-foot building and drops a ball off the building. The ball is traveling at a rate of 20 feet per second. How far off the ground will the ball be after 8 seconds? a.) m = 2 b.) m = 200 c.) m = 20 d.) m = 8 For Problems 8 10, graph the following: 8.) y = 5 9.) x = 3 10.) y = 2x 3 11.) Write the equation of the line graphed below:

14 12.) Sketch a graph of a line that has 0 slope: 13.) Sketch a graph of a line with undefined slope: 14.) Choose the equation that has the steepest slope. Circle your answer. A.) y = 2x 15 C.) y = 6 5 x 5 B.) y = 3 x 5 D.) y = 3x ) Given the graph at the right, identify which line has a steeper slope and why? 16.) Find the slope of each line segment: a.) AB: C b.) BC: c.) Use similar triangles to explain why the slope is the same from any two points on the line for #16. A B

15 For Problems 17 and 18, identify the independent and dependent variables, write an equation in slope-intercept form to represent the situation, and answer the question about the problem, showing all work. 17.) Mack drove to the pumpkin patch to pick out a pumpkin for Halloween. He spent a total of $3.50 on gas and the pumpkins cost $5 each. Let p be the number of pumpkins Mack picked out and let m be the total amount of money (in dollars) he spent that day for the pumpkin trip. = (independent variable) = (dependent variable) Equation: Mack drove to the pumpkin patch and purchased four pumpkins. Use your equation to find out how much total money Mack spent that day for the pumpkin trip. (Show all work!) 18.) Jack bought a printer for $75. He noticed that ink cartridges cost $35 each for the printer he purchased. Let c be the purchase price of both printer and cartridges, and let i be the number of in cartridges he purchased. = (independent variable) = (dependent variable) Equation: Use your equation to find the total cost to purchase the printer and 12 ink cartridges.

16 Determine the domain & range of each relation and identify if it is a function. Circle either Yes or No 19.) x y 20.) { ( 4, 3), ( 3, 1), (0, 1), (2, 4) } Domain : Domain : Range: Range: Function: Yes or No Function: Yes or No 21.) 22.) x y Domain : Range: Domain : Range: Function: Yes or No Function: Yes or No 23.) 24.) Is the graph a function? Yes or No Is the graph a function? Yes or No 25.) Johnny says the graph at the right is not a function. Do you agree or disagree? Justify your response.

17 Fill in the t-chart for each equation, graph the equation, and identify whether it is linear or non -linear function. 26.) y = 2x 3 27.) y = 3x ) y = x x 2x 3 y 2 2( 2) x 3x + 4 y x x y 2 ( 2) Circle One: Linear or Non-Linear Linear or Non-Linear Linear or Non-Linear Read the statement to determine if the dependent variable goes up or down. 29.) As the number of hours you use your air conditioner goes up, the amount of your air conditioning bill goes up or down. 30.) As the amount of yearly rainfall goes down, the fire danger in Arizona goes up or down. 31.) As the number of hours you study goes up, your grade point average goes up or down. For 32 and 33, determine if the equation is linear. 32.) y = 4x Circle one: This equation is / is not linear. 33.) y = 1 3 x 5 3 Circle one: This equation is / is not linear. 34.) Define a function:

18 35.) Give an example of a graph that is not a function: Determine if the independent and dependent labels are placed in the appropriate column. Fill in the last column with YES or NO whether they are correctly placed. Independent Dependent Is the placement correct? YES or NO 36.) X Y 37.) Output Input 38.) Domain Range 39.) Number of Square Feet Amount of Carpet Purchased 40.) Cost of Restaurant Bill Number of People 41.) Population growth Number of Years 42.) Length of class Number of Problems Practiced

19 For Exercises 1-5, consider the following situation. The deli in the grocery store gives each customer a free cup of coffee worth $ Write a function to represent the situation Make a function table to find the total cost of the coffee if 3, 6, 9, or 12 customers come in Graph the function State the domain and range of the function Is the function continuous or discrete? Explain. 5. For Exercises 6 and 7, find each function value. 6. f( 4) if f(x) = 2x f(5) if f(x) = 6x 1. 7.

20 8. A circle has a radius of r inches. The area of a circle is represented by the expression 3.14r 2. The area of a circle is a function of the radius. Does this situation represent a linear or nonlinear function? Explain. 8. For Exercises 9-11, consider the following situation. The total cost of renting a carpet cleaner from Carpets Inc. is represented by the function y = 10x + 80, where x represents the number of days and y represents the total cost. The cost of renting a carpet cleaner from Clark Cleaners is shown in the table. Number Cost ($) of Days Compare the functions rates of change Find and interpret the initial value of renting from Clark Cleaners Which company should you use if you rent the carpet cleaner for 6 days? Sketch a qualitative graph that represents a cup of hot coffee cooling down to room temperature quickly Graph y = x y O x

21 MATH 8 CATALINA FOOTHILLS SCHOOL DISTRICT Overarching Understandings for the Course: Students will understand Number Systems, Percents, Expressions, Equations, and Inequalities, Exponent Rules, Functions, Systems of Equations, and Statistics. Systems of Equations: (No Calculators and Show All Work.) 1.) Using the Number of Solutions below, graph an example of the three types of systems possible with two linear equations. Number of Solutions: One Solution No solution Infinite solutions For Problems 2 4, what is the solution to each system of graphed equations? 2.) 3.) 4.) Solution: For Problems 5 and 6, use the graphing method to solve the system of equations. 5.) y = 2x +1 y = 3x 3 6.) y = 4x + 3 y = 2x 3 Solution: Solution:

22 y = 3x 5. Is she correct? Check y = 2x + 5 by showing her work. y = 3x 5 y = 2x ) Sedona says that the ordered pair ( 2, 1) is a solution to the system Is Sedona correct? Yes or No For Problems 8 and 9, solve the system by elimination. 5x + 3y = 2 8.) 2x 3y = 16 9.) 4x 3y = 6 3x + 2y = 30 Solution: Solution: For Problems 10 and 11, solve the system by substitution. x + 3y = 9 10.) 11.) 2x y = 10 y = 2x + 4 y = 4x 2 Solution: Solution:

23 For Problems 12 15: The graph shows the lengths, l, of two candles (in inches) after h hours. 12.) What was the height of each candle after an hour? Green Candle: Blue Candle: 13.) After how many hours are the candles the SAME length? What is that length? 14.) What is the meaning of the point ( 10, 0) in the context of the problem? 15.) What is the meaning of the y-intercept of the green line in the context of the problem?

24 MATH 8 CATALINA FOOTHILLS SCHOOL DISTRICT Overarching Understandings for the Course: Students will understand Number Systems, Percents, Expressions, Equations, and Inequalities, Exponent Rules, Functions, Systems of Equations, and Statistics. Statistics: (No Calculators and Show All Work.) 1.) Create a scatter plot for the following data set and then draw in a regression line. Height (inches) Weight a.) Find the equation of your best-fit line. b.) Find and interpret (in context) the slope of your line. c.) Does the x-intercept have any meaning in context? d.) Given that you are 65 inches tall, based on your linear model, how much would you weigh? Do you think this is realistic? Why or why not? e.) Based on the scatter-plot, a student concludes that a person s height causes them to weigh more. What is wrong with this student s thinking?

25 Summer Review (Algebra 1 to Geometry) Semester 2: Exponents/Polynomials/Linear Equations/Linear Inequalities For 1 10, simplify each expression. Leave only positive exponents in your answer. 1.) ( 3x) 3 x 4 y 7 2.) xy 3.) 3 2(ab)0 4.) 4x 3 y 5 ( ) 2 5.) 4y 1 6.) ( 8b) 1 7.) x 6 x 8.) ) x 3 x 7 10.) x 4 z 4 x 3 z 1 11.) Given the expression, 5x 2 9x +10: a.) classify by degree, b.) state the leading coefficient, and c.) classify by the number of terms. For 12 17, perform the indicated operation. Write your answer in descending powers. 12.) ( 8x 2 3x) + ( x 3 + 6x 2 ) 13.) ( 5t 3 +1) ( 4t 3 + 3t 2 ) 14.) ( x 3) ( 2x + 7) 15.) 4x 2 ( x 3 5x 2 + 2) 16.) ( x 5) 2 17.) 22a a ) Solve 2 3 x + 3 (x 5) = x. 2 For 19 21, solve each inequality, graph the solution set on a number line, and provide the interval notation. 19.) x 20.) 3 < 3x + 4 <10 21.) 4 x 4 or x < 2 22.) Sketch a graph of 3x + 4y = 8 and provide the x- and y-intercepts, slope, domain, and range. 23.) Sketch a graph of the solution set for y < 2 x +1. Then graph one point that is a solution and label 3 the point A, and one point that is not a solution and label the point X. 24.) Sketch a graph of h(x) = 1 3 x and provide the x- and y-intercepts, domain, and range. 25.) Due to an increased use of insecticides, the monarch butterfly population in the Midwest is decreasing. The population is one tenth as large each year as compared to the prior year. The butterfly population was initially 100,000. a) Write an equation for this situation. Be sure to identify your variables. b) After 5 years, what will the butterfly population be? Interpret your answer in context. 26.) The number of weeds in a yard are on the rise due to the recent rains. There were initially 30 weeds in the yard and each day 5 more weeds appear in the yard. a.) Write a model/equation for this situation. Be sure to identify your variables. b.) How many days will it take to reach 100 weeds in the yard? Interpret your answer in context.

26 Factoring Quadratics For 1 15, completely factor each expression. 1.) 12x x ) 2.) 16x ) 3.) 8x 6 32x 5 4x 4 +16x 3 3.) 4.) m 2 n +15mn + 56n 4.) 5.) 6a 4 b 4 2a 3 b + 8a 2 5.) 6.) 4c 2 4c +1 6.) 7.) 4x ) 8.) 3p 2 21p 24 8.) 9.) x 2 6x ) 10.) x 2 3x 10.) 11.) y 2 + 9y ) 12.) b 2 3b ) 13.) 7a 2 42a ) 14.) 2x ) 15.) 18x 2 12x )

27 Simplifying Square Root Expressions For 1 8, simplify the square root by finding perfect square factors. Your answer should be exact and not approximate, meaning it cannot be in decimal form. 1.) ) ) ) ) ) ) ) For 9 12, rationalize the denominator. This means get the square root (irrational number) out of the denominator, making it a rational number (integer). 9.) ) ) ) For 13 18, simplify the square root expression using the multiplication and division properties of radicals. Write your answer in simplest form (no decimals). 13.) ) ) ) ) ) 6 25 For 19 21, simplify the square root expression (fractions). 19.) 5 ± ) 10 ± ) 1± 8 5 Quadratic Functions In #1-6, solve each quadratic equation using one of the methods learned in class by factoring, by completing the square, by the square root method, and by using the quadratic formula. To review, you may wish to solve some of these equations using multiple methods to ensure that you are completely familiar with each type. 1.) 2x 2 x 1 = 0 2.) 2x 2 + x = 1 3.) x 2 + 4x +1 = 0 4.) 1 2 x 2 16 = 20 5.) 2(x 1) 2 3 = 0 6.) 2x 2 8x +1 = 0 7.) Consider the quadratic function f x ( ) = 2x 2 8x +1. Use the quadratic formula to find the coordinates of the vertex of the parabola and determine if it is the minimum or maximum value of the quadratic function. Explain your answer.

28 8.) Write the equation of ANY quadratic function that has one repeated x-intercept of 2, and that opens downward, and that is narrower than the graph of the parent function f (x) = x 2. 9.) Write the equation of ANY quadratic function that has zeros at (-4, 0) and at (9, 0) and opens downward. 10.) Write the equation of ANY quadratic function that has a vertex of (-3, -5), opens upward, and is wider than the graph of the parent function f (x) = x ) A ball is thrown upward and it reaches its maximum height of 17 feet exactly three 3 seconds after it is thrown. You know that a = 16. Write the equation of the quadratic function that models the height of the ball with respect to time. 12.) A frog hops according to a quadratic model that maps the height of the frog (in inches) in the air with respect to time (in seconds). If the frog leaps from the ground at t = 0 seconds and then lands at t = 3 seconds, write the quadratic model for the frog s jump if you know that a = ) You are given that h(t) = 16t t +1 models the height (in feet) of a ball with respect to time (in seconds). Find the maximum height the rocket of the rocket and the time to reach this height. In #14-17, sketch a graph of each of the following and provide the following information: Transformations Vertex Line of Symmetry x-intercept(s) y-intercept Domain & Range 14.) f (x) = x 2 2x 15.) f (x) = 8(x 1) ) f (x) = 3x 2 12x ) f (x) = 2( x 1) 2 3

29 Geometry - Transformations (This content is review from Math 8) 1.) The triangle R'K'O' shown was reflected over the x-axis. Find the original coordinates of triangle RKO. 2.) In the figure below,!d'e'f' is a dilation of!def. Find the scale factor of the dilation, and classify it as an enlargement or a reduction. For 3-4, triangle LPT is rotated 270 clockwise about the origin. The vertices of the triangle are L(3, 0), P(1, -4), and T(-3, -2). 3.) Find the coordinates of L', P', and T'. 4.) What is true about triangles LPT and L'P'T'? 5.) The point H'( 3, 4) is the result of a translation of 3 units right and 5 units down. Use translation notation to describe the translation. 6.) What are the coordinates of the image of Y(5, 3) after it is rotated 180 clockwise about the origin? 7.) An optometrist dilates a patient s pupils by a scale factor of 5 3. If the pupil after dilation has a diameter of 25 millimeters, find the original diameter before the pupil is dilated.

30 For 8 10, refer to the graph of triangle TRS below. 8.) Graph and label the image of!trs after a translation 3 units left and 2 units down. 9.) Graph and label the image of!trs after a reflection over the y-axis. 10.) Graph and label the image of!trs after a dilation by a scale factor of 1 2.

31 Geometry - Angle Relationships and Triangles (This content is review from Math 8) Multiple Choice: For 1 3, use the diagram at the right. 1.) Name a pair of corresponding angles. A.) 5 and 8 B.) 5 and 7 C.) 5 and 4 D.) 5 and 1 2.) Name a pair of alternate interior angles. A.) 3 and 6 B.) 3 and 4 C.) 4 and 6 D.) 1 and 8 3.) The pair of angles 6 and 7 are called: A.) corresponding angles C.) vertical angles B.) supplementary angles D.) alternate interior angles 4.) In the figure at the right, line m is parallel to line n. If m 5 = 3x 60 and m 4 = 7x what is the value of x? What is the m 5 and m 4? 5.) Find the value of a (in degrees). 6.) Find the value of a (in degrees).

32 7.) Find the third angle of a right triangle if one of the angles measures 36 o. 8.) Find the value of x, m A, and m B. A 9.) Use the diagram at the right to name all angles that measure 137 o. B 10.) Given: q m, find the measure of each angle. a. m 1= b. m 7 = c. m 3 = 11.) Find the value of x. 12.) Find the value of each angle in degrees.

33 14.) Given n p, find the m 3 and explain how you found the measure. 15.) Find the measure of a, b, c, and d. m a = m b = m c = m d =

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