A concrete foundation for a building has the shape of a rectangular prism. The foundation is 15 yards long, 10 yards wide, and 3 yards high. If concrete costs $3 per cubic yard, how much did the concrete cost for the foundation?

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answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

56

step-by-step explanation:

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

x + 4/7

step-by-step explanation:

use cymath