Line PQ is parallel to line RS. If angle PQR is equal to 36°
a) What is the size of angle QRS?
b) Give a reason for your answer.

What is 20+(5 x 2/5 )+ 3 show your work

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?