write the phrase nineteen less than the quotient of a number and fifteen as a mathematical expression

Solve the system of equations. y= 2x y= x^2 - 15

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.