Chris sells books for a commission of $2.60 per book and $50 a month. his salary is determined by the function m=2.60 b+50, where (m) is the amount of money he earns and (b) is the number of books he sells. if chris sells 25 books how much money did he earn? *

M=2.60b + 50

When b = 25

M = 2.60(25) + 50 = $115

Chris earns $115 for selling the 25 books.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)