Sally has seventy dollars to spend on eight books. After buying them she had thirteen dollars. How much did each book cost?

Is the open sentence 5x-2=3x+2 true when x=2? justify your answer.

1. what is the phythaforean theorem? 2.what do we use it for? 1.what is the distance formula ? 2.what do we use it for?

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.