Please, help me! ( Thank You ) :)

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.

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b