Not all tiles will be used Match the systems of equations to their solutions

2x+y=12 x+2y=9 x+3y=16
x=9-2y 2x+4y=20 2x-y=11

y=11-2x y=10+x 2x+y=11
4x-3y=-13 -3x+3y=30 x-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