Why Do we use variables

Which quadratic function opens down and has a vertex with a negative y value? A. f (x) = 5x^2-18 B. g (x) = - 4x^2+7x+20 C. h (x) = - 1/2 (x-9) ^2+1 D. j (x) = - 10 (x+6) ^2 - 3

Solve for x. cos (2x - 4) = sin (6x)

During the first four months of the year, Jack earned $1270, $1150, $870 and $1450 If Jack must have an average salary of at least $1150 in order to earn retirement benefits, what must Jack earn in the fifth month in order to qualify for benefits?

Round 328 to the nearest hundred

What is the probability of selecting a male from a group of 4 males and 8 females?

Give two ways to write the expression as a phrase 6+p

4. Write 5 x 5 x 5 x 5 using exponents. A. 45 B. 52 c. 55 D. 54

What is nine divided by 63 equals what?

What is the radical form for 2 1/2

What is the measure of angle BAC? Round to the nearest whole degree.