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?

This is so hard and it’s for a test

How can (square root of 25) ^2 be rewritten?

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?