I need help please look at the picture

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

The table below shows the height of a ball  x  seconds after being kicked.  what values, rounded to the nearest whole number, complete the quadratic regression equation that models the data? f(x)  =  x2  +  x  +  0based on the regression equation and rounded to the nearest whole number, what is the estimated height after 0.25 seconds?   feet

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.