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Biblioteka

IAR Grade 8: Math - In progress!

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Posljednje ažuriranje over 3 years ago
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The use of a calculator is allowed for questions 17 to 22.

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Pitanje 1
1.

The number of bottles a machine fills is proportional to the number of minutes the machine operates. The machine fills 250 bottles every 20 minutes. Create a graph that shows the number of bottles, y, the machine fills in x minutes.

Utilize the drawing tools in the Show Your Work space to plot two points and draw a line.

[Calculator permitted]

Pitanje 2
2.

Two different proportional relationships are represented by the equation and the table.

Use the drop-down menus to complete the sentence comparing the rates of change of the proportional relationships.

The rate of change in Proportion A is than the rate of change in Proportion B.

[Calculator permitted]

Pitanje 3
3.

Eric planted a seedling in his garden and recorded its height each week. The equation shown can be used to estimate the height, h, in inches, of the seedling by the end of each week, w, after it was planted.

[Calculator permitted]

Part A

What does the slope of the graph of the equation h=\frac{3}{4}w+\frac{9}{4} represent? Choose from the answers below and enter the letter in the box:

a. the height, in inches, of the seedling after w weeks

b. the height, in inches, of the seedling with Eric first planted it

c. the increase in the height, in inches, of the seedling each week

d. the total increase in the height, in inches, of the seedling after w weeks

Part B

The equation h=\frac{3}{4}w+\frac{9}{4} estimates the height of the seedling to be 8.25 inches after how many weeks? Enter your answer in the box:

Pitanje 4
4.

A partially filled input-output table is shown. Complete the table so that it represents a function.

Input Output

1 4

Select each number from the list within each dropdown.

Pitanje 5
5.

Solve this equation for x.

0.5(5-7x)=8-(4x+6)

Pitanje 6
6.

Increasing

Decreasing

Neither Increasing nor Decreasing

-7<x<-3

-3<x<-1

-1<x<1

1<x<3

3<x<5

5<x<7

Pitanje 7
7.

Select the point on the number line that best approximates the location of \sqrt{14}.

[vertical positioning of the points are irrelevant]

Pitanje 8
8.

Functions A, B, and C are linear functions.

Some values of Function A are shown in the table.

The graph of Function B has a y-intercept of (0,3) and an x-intercept of (-5,0).

Function C is defined by the equation y=(3x+1).

Order the linear functions based on rate of change, from least to greatest:

[Calculator permitted]

Least Rate of Change

Neither Least or Greatest Rate of Change

Greatest Rate of Change

Drugi mogući odgovor:
Function C
Function B
Function A
Pitanje 9
9.

Which equation has both 4 and -4 as possible values of y?

Pitanje 10
10.

A system of equations is shown.

x=10\\ 3x+5y=20

What is the solution (x,y) of the system of equations?

Enter your answers in the boxes.

( , )

Pitanje 11
11.

Classify each equation as defining y as a linear or nonlinear function of x.

Drag or click the equation into the appropriate category.

  • y=7\times{4x}

  • y=(2x+5)^2

  • y=10x^2

  • y=5x-3

  • y=\frac{x}{2}

  • y=2x^{3}+1

  • linear

  • nonlinear

Pitanje 12
12.

Consider the system of equations.

y=2x+2\\y=6x+2

Select from the drop-down menus to correctly complete each statement.

The graph of the system consists of lines that have solution.

Pitanje 13
13.

Which of these equations represent functions where x is the input and y is the output? Select each correct answer.

Pitanje 14
14.

Solve this equation for x.

0.5(5-7x)=8-(4x+6)

Pitanje 15
15.

Three congruent figures are shown on the coordinate plane.

Part A

Select a transformation from each drop-down menu to make the statement true.

Figure 1 can be transformed onto figure 2 by .

Part B

Figure 3 can also be created by transforming figure 1 with a sequence of two transformations.

Select a transformation from each drop-down menu to make the statement true.

Figure 1 can be transformed onto figure 3 by .

Pitanje 16
16.

The graph represents y as a function of x. Place one additional point on the coordinate plane so that the graph continues to represent y as a function of x.

Use the drawing tools in the Show Your Work space to plot the point on the coordinate plane.

Pitanje 17
17.

The graph shows y as a function of x.

For which intervals is the function decreasing?

Select all that apply.

Pitanje 18
18.

The equation of line s is y=\frac{1}{3}x-3.

The equation of line t is y=-x+5.

The equations of lines s and t form a system of equations. The solution to the system of equations is located at point P.

a. Graph lines s and t using the graphing tool below.

b. In the Show Your Work space, plot Point P and write its coordinates.

  • Kliknite na karticu Grafikon (Grafikon 1, Grafikon 2 i tako dalje) za svaki grafikon koji trebate nacrtati.
  • Kliknite na pozadinu grafikona da biste dodali tačku. Dodajte dvije tačke da biste kreirali grafikon. Prevucite tačku ili unesite x i y koordinate da biste uredili njen položaj. Kliknite na tačku da biste je izbrisali.
  • Nakon što kreirate grafikon, možete označiti kućicu s isprekidanom linijom.
Pitanje 19
19.

Which statement best describes the value of \sqrt{8}?

Pitanje 20
20.

Which equation has both 4 and -4 as possible values of y?

Pitanje 21
21.

A system of equations is shown.

{x=10}\\{3x+5y+20}

In the system of equations, what is the value of y?

Pitanje 22
22.

Which equations define y as a nonlinear function of x?

Select all that apply.

Pitanje 23
23.

Consider the system of equations.

{y=2x+2}\\{y=6x+2}

Which statements are true about the system of equations?

Select each correct answer.

Pitanje 24
24.

Which decimal is the equivalent of \frac{6}{11}?

Pitanje 25
25.

Seven line segments are shown on the coordinate plane.

Which of these segments could be the image of segment AB after a sequence of reflections, rotations, and/or translations?

Select each correct answer.

Pitanje 26
26.

Use the information provided to answer Part A and Part B for this question.

Three congruent figures are shown in the coordinate plane.

Part A

Which statement describes a possible sequence of transformations that transforms figure 1 into figure 2?

Pitanje 27
27.

The graph represents y as a function of x.

Which additional point can be plotted so that the graph continues to represent y as a function of x?

Pitanje 28
28.

Which expressions are equivalent to \frac{3^{-8}}{3^{-4}}?

Select all that apply.

Pitanje 29
29.

The equation of line s is y=\frac{1}{3}x-3.

The equation of line t is y=-x+5.

The equations of lines s and t form a system of equations. The solution to the system of equations is located at point P.

Which graph correctly shows line s, line t, and point P?

Pitanje 30
30.

A scatter plot is shown on the coordinate plane.

Which of these most closely approximates a line of best fit for the data in the scatter plot?

Pitanje 31
31.

The body of a 154-pound person contains approximately 2\times10^{-1} milligrams of gold and 6\times10^{1} milligrams of aluminum. Based on this information, the number of milligrams of aluminum in the body is how many times the number of milligrams of gold in the body?

Pitanje 32
32.

A solution is 20% bleach.

Which graph represents the number of liters of bleach, y, contained in x liters of solution?

[Calculator permitted]

Pitanje 33
33.

Use the information provided to answer Part A and Part B for this question.

[Calculator permitted]

Filipo is building a rectangular sandbox for his younger brother. The length of the sandbox is 1 foot longer than twice the width of the sandbox. The perimeter of the sandbox is 29 feet.

Part A

Which equation could be used to determine w, the width, in feet, of the sandbox? Enter the corresponding letter in the answer box.

a. w+w+2=29

b. w+2w+1=29

c. 2w+2(w+2)=29

d. 2w+2(2w+1)=29

Part B

What is the width, in feet, of the sandbox?

Pitanje 34
34.

The gasoline mileage for two cars can be compared by finding the distance each car traveled and the amount of gasoline used. The table shows the distance that car M traveled using x gallons of gasoline. The graph shows the distance, y, that car P traveled using x gallons of gasoline.

Based on the information in the table and the graph, compare the approximate miles per gallon of car M to car P. Show your work or explain your answer.

[Calculator permitted]

Pitanje 35
35.

Use the information provided to answer Part A and Part B for this question.

[Calculator permitted]

The figure shows line RS parallel to line UV. The lines are intersected by 2 transversals. All lines are in the same plane.

Part A

Explain why triangle RTS is similar to triangle VTU.

Part B

Given that m\angle{STV}=108\degree, determine m\angle{SRT}+m\angle{TUV}. Show your work or explain your answer.

Pitanje 36
36.

Use the information provided to answer Part A through Part D for this question.

[Calculator permitted]

Line t is shown in the coordinate plane.

Part A

What is the slope of line t?

Part C

Line s (not shown) has the same slope and passes through the point (0,4). Which table represents 4 points on line s?

Pitanje 37
37.

Use the information provided to answer Part A through Part C for this question.

[Calculator permitted]

Martin is considering the expressions \frac{1}{2}(7x+48) and -(\frac{1}{2}x-3)+4(x+5). He wants to know if one expression is greater than the other for all values of x.

Part A

Which statement about the relationship between the expressions is true? Enter the corresponding letter of the correct statement.

a. The value of the expression \frac{1}{2}(7x+48) is always equal to the value of the expression -(\frac{1}{2}x-3)+4(x+5).

b. The value of the expression \frac{1}{2}(7x+48) is always less than the value of the expression -(\frac{1}{2}x-3)+4(x+5).

c. The value of the expression \frac{1}{2}(7x+48) is always greater than the value of the expression -(\frac{1}{2}x-3)+4(x+5).

d. The value of the expression \frac{1}{2}(7x+48) is sometimes greater than and sometimes less than the value of the expression -(\frac{1}{2}x-3)+4(x+5).

Part B

Show or explain how you found your answer to Part A.

Enter your work or your explanation in the Show Your Work Space.

Part C

Write a new expression that always has a greater value than both of these expressions.

Pitanje 38
38.

Use the information provided to answer Part A and Part B for this question.

[Calculator permitted]

The figure shows a right-circular cylinder and a right-circular cone. The cylinder and the cone have the same base and the same height.

Part A

What is the volume, in cubic feet, of the cone?

Pitanje 39
39.

In \triangle{ABC}, \overline{BD} is perpendicular to \overline{AC}. The dimensions are shown in centimeters.

What is the length, in centimeters, of \overline{AC}?

[Calculator permitted]

Pitanje 40
40.

Relationship A is defined by the equation y=9x.

Some values of relationship B are shown in the table.

Both relationships represent a direct proportion between x and y. The rate of change of relationship B is how many units greater than the rate of change of relationship A?

Pitanje 41
41.

Two utility companies sell electricity in units of kilowatt-hours. The cost of electricity for company P is shown in the table. The cost of electricity for company M can be found by using the equation shown, where y represents the total cost in dollars for x kilowatt-hours of electricity.

  • Use the information provided to find the unit rate, in dollars per kilowatt-hour, for each company. Show your work or explain your answers in the Show Your Work space.

  • Find the total cost, in dollars, of buying 2,375 kilowatt-hours of electricity from the least expensive company.

[Calculator permitted]

Pitanje 42
42.

Use the information provided to answer Part A and Part B for this question.

[Calculator permitted]

In a system of two linear equations, the lines represented by each equation have the same slope.

Part A

Which could be the total number of solutions to the system of equations?

Select each correct answer from the list below.

Part B

Explain why you chose your answer(s) in Part A in the Show Your Work space.

Pitanje 43
43.

Line t and \triangle{ECA} and \triangle{FDB} are shown on the coordinate plane.

Which statements are true? Select all that apply.

[Calculator permitted]

Pitanje 44
44.

Use the information provided to answer Part A and Part B for this question.

[Calculator permitted]

The owner of a computer store is offering a discount on a computer sold in the store.

Part A

The owner offers a payment plan where the total cost of the computer is paid in 6 equal monthly payments.

  • Determine the amount of each monthly payment:

  • Show your work or explain your answer in the Show Your Work space.

Part B

A different computer is advertised as 40% off of the original price. After the discount, the tax is $44.64.

  • Determine the total price of this computer after the discount and tax are applied:

  • Show your work or explain your answer in the Show Your Work space.

  • Determine the original price of this computer:

  • Show your work or explain your answer in the Show Your Work space.

Pitanje 45
45.

Function A is a linear function. Some values of Function A are shown in the table.

Function B is a linear function with a y-intercept of and an x-intercept of -5.

Which statement is true?

[Calculator permitted]

The graph shows y as a function of x.

For each interval in the table, indicate whether the function is increasing, decreasing, or neither increasing nor decreasing over the interval.