Write an equivalent expression. 4x - x

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 number 321,000,000 in scientific notation? also what is the number? ?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?