Given 3x + y = 17 and x + 3y = -1. find the value of 3x + 3y.
(a) 12
(b) 16
(c) 22
(d) 28
(e) 40

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

The measure of an angle is 117°. what is the measure of a supplementary angle?