90×(2÷12) please help its for maths

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?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.