Which expression is equivalent to 4c + 9c?

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?