If -48 equals 6(a) then a is what

Which of the following are parts of a sphere

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?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.