F(x+h) -f(x) over h what do I do first

Given this information, which expression must represent the value of b?

What is the vertical asymptotes of the function f(x)=x-2/x*2-3x-4

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?