Solve the system of linear equations below.

y = -2x + 19
y = x + 7

a. x = 4, y = 11
b. x = -12, y = -5
c. x = -4, y = 3
d. x = 8, y = 3

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