Which number(s) below belong to the solution set of the equation? check all that apply. 18x = 198 a. 21 b. 19 c. 11 d. 9 e. 22 f. 18

The answer is 11.

You simply divide by 18 on both sides.

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

answer: two angles are called supplementary if they add up to 180°. example: the two angles (140° and 40°) are supplementary because they add up to 180°.

step-by-step explanation: