Please help me find the domain and range

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

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?

What is the area of triangle abc if a = 8, b = 11, and c = 15?