A metalworker has a metal alloy that is 25 % copper and another alloy that is 70 % copper. How many kilograms of each alloy should the metalworker combine to create 100 kg of a 61 % copper alloy?

a ball is dropped from a height of 784ft. It's height h, in feet, after t seconds is given by h (t) = 784-16tsquared. After how long will the ball reach the ground?

Bryant's pool contains 13,000 gallons of water. The maximum rate at which the city allows pools to be drained is 720 gallons per hour.

The library has thirteen rows of bookcases. All the bookcases have four shelves that can hold 25 books each. If the shelves are 4/5 full, how many | books are in the library?

Negative 9 minus negative 10

What is f (2) >0 telling me about a graph?

Juanita wrote 3 x 47 as 3 x 40 + 3 x 7. Which property did she use to rewrite the expression?

Ella runs a cat rescue center. She started with 2 cats, and her center has an increase of 5 cats per year.

Round 2874992 to nearest 10000

Decide whether a discrete or continuous random variable is the best model for each of the following variables: (a) The time until a projectile returns to earth. (b) The number of times a transistor in a computer memory changes state in one operation.

The rquation of a citcle is x^2+y^2=16 what is the radius of the circle