I need help I'm not good in math

Adaylily farm sells a portion of their daylilies and allows a portion to grow and divide. the recursive formula an=1.5(an-1)-100 represents the number of daylilies, a, after n years. after the fifth year, the farmers estimate they have 2225 daylilies. how many daylilies were on the farm after the first year?

Find an equation for the linear function which has slope -10 and x-intercept -7

It says factor each expression 49x-28?