Help asap plspls !! :)

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

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