Explain how an estimate you to place the decimal point when multiplying 3.9x5.3

Write an equation in point-slope form for the line through the given point that has the given slope (-2,-7); m=-3/2

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)