1st Semester Final Exam Review - Math 8

Which of the numbers is irrational?

• $\sqrt{16}$

• $\sqrt{81}$

• $\sqrt{45}$

• $\sqrt{225}$

Joey has a beach ball with a radius of 15 cm. What volume of air will it hold when fully inflated? [Round to nearest tenth.]

• 942.5 cm³

• 14,137.2 cm³

• 3,534.3 cm³

Find the difference and express the answer in scientific notation.

452.6 x 10³ - 3.7 x 10⁵

• .826 x 10⁵

• 8.26 x 10⁵

• 8.26 x 10⁴

• 82.6 x $10^4$

Describe the transformation.

• Rotation 180 $\degree$

• Reflection over the y-axis

• Rotation 90 degrees clockwise

• Reflection over the x-axis

What rule moves the original to the image?

• (x+2,y+2)

• (x-2, y+2)

• (x+2,y-2)

• (x-2,y-2)

The triangle has been dilated with a scale factor of

• 1

• $\frac{1}{2}$

• 2

• $\frac{2}{3}$

A 17 meter piece of string is stretched from the top of a 15 meter flagpole to the ground. How far is the base of the flagpole from the end of the piece of string?

• 8 m

• 64 m

• 22.7 m

• 514 m

 Divide and give the answer in scientific notation.
 $\frac{7.5\ x10^4}{4.8x10^{-6}}$  

• 1.5625 x $10^{-2}$  

• 1.5625 x  $10^{10}$  

• 1.5625 x  $10^2$  

Multiply (5.7 x 10⁴) by (4.4 x 10¹⁵). Express your answer in scientific notation.

• 25.08 x 10¹⁹

• 2.508 x 10¹⁸

• 25.08 x 10¹⁷

• 2.508 x 10²⁰

The triangle shown MUST be a right triangle if

• 13

• 169

• 11

• 12