8th Grade CT STAAR Review #2

The diagram shows a right triangle and the lengths of two of its sides in inches. Which measurement is closest to the value of d in inches?

• 6.3 in.

• 4.0 in.

• 14.3 in.

• 19.8 in.

Which set of ordered pairs represents y as a function of x ?

• {(0, 0.5), (2, 1.5), (-5.5, 5), (-5.5, 6)}

• {(5, -7), (3, -7), (-9.2, -7), (9.2, -7)}

• {(9.3, -1), (7.3, -2), (7.3, 2), (9.3, 1)}

• {(8.1, 9), (9.1, 10), (10.1, 9), (9.1, 8)}

Tamara invested $15,000 in an account that pays 4% annual simple interest. Tamara will not make any additional deposits or withdrawals. How much interest will Tamara earn on her investment at the end of 3 years?

• $1,800

• $600

• $450

• $1,873

Based on the scatterplot, what is the best prediction of the speed of sound when the air temperature is 50°C?

• 350 m/s

• 355 m/s

• 360 m/s

• 365 m/s

Based on the scatterplot, what is the best prediction of the average amount of money spent on groceries for a household that has 7 people?

• $240

• $190

• $210

• $300

The graph shown below represents the relationship between the number of cookies and the cost of the cookies that a bakery sells. What is the unit rate and what does it represent?

• 0.5, the number of cookies

• 1, the cost per cookie

• 0.5, the cost per cookie

• 1, the number of cookies

Trapezoid KLMN was dilated with the origin as the center of dilation to create Trapezoid K'L'M'N'. Which rule best represents this dilation from Trapezoid KLMN to Trapezoid K'L'M'N'?

Rectangle EFGH was dilated with the origin as the center of dilation to create Rectangle E'F'G'H'. Which rule best represents this dilation from Rectangle EFGH to Rectangle E'F'G'H'?

• (x, y) → (x + 20, y + 20)

• (x, y) → (x - 20, y - 20)

• (x, y) → (2x, 2y)

• (x, y) → (0.5x, 0.5y)

Which numbers from this list are less than -0.94?

There are four students working on an assignment in a class. Mike has completed 1/9 of the assignment, Gwen has completed 11% of the assignment, Jorge has completed 0.12 of the assignment, and Tai has completed 1/8 of the assignment. Which of the following lists the students in order from least to greatest by the amount of the assignment they completed?

• Gwen, Mike, Jorge, Tai

• Tai, Jorge, Mike, Gwen

• Gwen, Jorge, Mike, Tai

• Tai, Mike, Gwen, Jorge