8th grade Review 18

An architect creates house planes for a client using the scale 1in. 4ft. A room that will be 18 feet long is how many inches long on the plan.

• 9 in.

• 72 in.

• 4.5 in.

• 9 ft.

The stat of Colorado is nearly a rectangle with dimensions as shown. Express the area of the state in scientific notation.

• $1.2\times10^{13}mm^2$

• $1.6\times10^{12}mm^2$

• $1.2\times10^{12}mm^2$

• $1.33\times10^{12}mm^2$

The price of the item was $48.00 plus 7.5% sales tax. What was the total price including tax?

• $3.60

• $44.40

• $51.36

• $51.60

If a coin is flipped four times, what is the probability of getting heads all four times?

• $\frac{1}{8}$

• $\frac{1}{16}$

• $\frac{1}{2}$

• $\frac{1}{12}$

What is the lateral surface area of this triangular prism?

• $144\ cm^2$

• $120\ cm^2$

• $96\ cm^2$

• $168\ cm^2$

A bag contains four red marbles, three blue marbles, two yellow marbles, and one green marble. Two marbles are drawn from the bag, one at a time, without replacement. What is the probability of drawing two marbles?

• $\frac{1}{45}$

• $\frac{1}{15}$

• $\frac{1}{5}$

• $\frac{1}{10}$

The height of a pyramid with a square base is 4ft. What is the volume of the pyramid?

• $48\ ft^3$

• $96\ ft^3$

• $8ft^3$

• $24ft^3$

Which of the following equations is a rule for this sequence?

6, 11, 16, 21, ...

• $a_n=n+5$

• $a_n=5n+1$

• $a_n=6n-1$

• $a_n=n\left(5+1\right)$

Which of the following represents the union of the set of prime numbers and the set of composite numbers?

• {..., -2, -1, 0, 1, 2,...}

• {0, 1, 2, 3,...}

• {1, 2, 3, 4,...}

• {2, 3, 4, 5,...}

What is the area of this trapezoid?

• $180\ in.^2$

• $144\ in.^2$

• $112\ in.^2$

• $176\ in.^2$