9t + 21t - 8
It needs to be factored

What is the simplified expression for 6(2(y+x))

Cherie measures and records the lengths and sizes of the same style of a sandal found at a shoe store. which equation can be used to determine the approximate shoe size, s, for a foot length of x inches? s = x – 2 s = 2x – 10 s = x + 6 s = 2x + 4

Two numbers have a sum of -19. one number is x. what expression represents the other number?