Which of the following best describes the expression 9(x + 7)? a. the sum of constant factors 9 and x + 7 b. the product of constant factors 9 and x + 7 c. the product of a constant factor 9 and a 2-term factor x + 7 d. the sum of a constant factor 9 and a 2-term factor x + 7

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%