An exam has 20 exercises. For every exercise solved correctly you get 8 points and for every exercise solves wrong are taken off 5 points. Ben had 13 points. How many exercises did he solve?

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.

a: 18°

step-by-step explanation: