Please help urgently 1. Simplify the following expressions:
a. 4m +4n-6m + 3n+ 10m - 8n
b. 12x + 10y - 4y + 8x - 10x + 5y
d. 12ab - 5b + 3a - 9b + 12ab
c. -3b + 6a - 8b - 4a + 12b
e. 60 - 4d + 150
f. -4b - 4a + 12ab
g. -8m + 4n - 7m - 12n
i. 8x2 - 6x3+4x3 - 2x2
h. -5y2 + 3x - 4x2 + 8y2
j. -12a + 8a - 2a2 + 3a? - 5a​

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