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

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables