What is the greatest whole number that round to 621860

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 slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

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