Peter was thinking of a number. Peter divides by 7, then adds 5 to get an answer of 13. What was the original number?

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Determine domain and range, largest open interval, and intervals which function is continuous.

Which shows one way to determine the facts of x3+4x2+5x+20 by grouping