20%of what number gives you 80

In a roller-skating rink, the skaters all move at different speeds. Most skate slightly faster or slower than others, but sometimes an adventuresome skater accelerates to an "outlying" speed that is much higher than that of everyone else, creating a

A submarine descends from sea level to the entrance of an underwater caves. the elevation of the entrance is 120 feetv.

Which of the following is a solution for 5 - 2x ≤ - 3? -4 -1 1 4

What is the inverse of f (x) = 3? (Hint: Write the function as y = 0x + 3.) Is the inverse a function? Explain.

I got a 19% on the biology final, hows your finals doing?

A television that was originally marked $199.95 is now 25% off. Write a linear expression for the new cost of the television. Then calculate the sale price of it. A. c - 0.25c; $49.99 B. c + 0.25c; $249.94 C. c - 0.25c; $149.96 D. c + 0.25c; $149.96

What's the addictive inverse of 4x - 5

A stack of boards is 21 inches high. Each board is 1 and 3/4 inches thick. How many boards are there?

There are 90 students in Grade 5, and 10% of them were absent today. In Grade 6, 15% of the 80 students were absent today. What was the total number of students in the two grades who were present today?

Solve for x: 4 (3x + 12) = - 36 x =