89.87 is 215% of what number

A stack of boards is 24 inches high. The thickness of each board is 3/8 inch. How many boards are in the stack A. 1/9 B. 1/6 C. 9 D. 64

3^3*4^-2*4^-4= A:3^-5*4^-6 B:3^5*4^6 C:3^5/4^6 D:12^2

Find the common factors of 50 and 30

Kelvin saves $60 a day. Al saves $90 a day. How many times Kelvin's savings are Al's savings?

Two positive angles that form a straight line together and measures total 180 degrees form a

Solve for c. ab + c = 5

What is the value of k in the product of powers below? 10 Superscript negative 3 Baseline times 10 times 10 Superscript k Baseline = 10 Superscript negative 3 Baseline = StartFraction 1 Over 10 cubed EndFraction

There are 15 marbles in a bag. 7 are red, the rest are a variety of colors. You want the chance of getting red to be at least 50%. How many red do you need to add?

Write 450 miles per 18 gallons as a unit rate (miles per gallon)

If 15 hats cost $120 and all the hats all cost the same amount, what is the price of each hat?