91Ó°ÊÓ

Solve the equation using mental math.

$\frac{b}{5}=8$

Identify the property that the statement illustrates.

$m n + 0 = m n$

Solve the equation.

$x+12=9$

The Great Pyramid in Egypt was built around 2560 B.C. Over the years, it has lost 30 feet of height off its top and is now 451 feet tall. Find the original height of the Great Pyramid.

Solve the equation. Check your solution.

$-0.504+h=-0.18$

Trip Your family drives 150 miles to an amusement park at an average speed of 50 miles per hour. How long does the trip take?

Solve the equation.

$-4=h-20$

Use the distributive property to write an equivalent variable expression.

$3 (  y  +  9  )$

Identify the property that the statement illustrates.

$19  ·  5^3  =  5^3  ·  19$

Solve the equation. Check your solution.

$-110=12y+10y$