Which of the following is equivalent to the expression x + 3x + 5x for all values of x? 8x
9x3
9x
8x3

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Determine whether the points (–3,–6) and (2,–8) are in the solution set of the system of inequalities below. x ? –3 y < 5? 3x + 2 a. the point (–3,–6) is not in the solution set, and the point (2,–8) is in the solution set. b. neither of the points is in the solution set. c. the point (–3,–6) is in the solution set, and the point (2,–8) is not in the solution set. d. both points are in the solution set.