L 4.4.2 Test (CST): Systems of Equations and Inequalities Question 23 of 25
Which of these shows the result of using the first equation to substitute for y
in the second equation, then combining like terms?
y= 2x
2x + 3y = 16
A. 4x= 16
O B. 8x = 16
C. 5x = 16
O D. 5y= 16

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