PLEASE HELP ASAP giving out brainllest

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?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Find the distance between (7,-6) and (-3,-9)