Amaths test has two prolems. the first was solved by 70% of the students. the second was solved by 60%. every student solved at least one of the problems. how many students took the test?

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

Average acceleration: i have no idea how to do this.

This is about circle theorems. someone asap : (