Which step could you use to start solving the system of equations below? x + y = 3
-3x - 2y = -7

Group of answer choices
A. Multiply -3x - 2y = -7 by 2 and subtract it from x + y = 3

B. All of the above.

C. Multiply x + y = 3 by 3 and add it to -3x - 2y = -7

D. Add x + y = 3 to -3x - 2y = -7

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.