Please help i haven't learned this yet Explain the process of finding either the area or circumference of a circle.

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

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?