Twice a number is decreased by 9, and this sum is multiplied by 4. the result is 8 less than 10 times the number. what is the number?

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

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

Two numbers have a sum of -19. one number is x. what expression represents the other number?