Your online reviews have averaged 4.2 over 120 reviews. How many 5 ratings do you need to get to a 4.5 average?

Which of the following properties can be used to show

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?

How do you use the elimination method for this question? explain, because i really want to understand!