What is the formula to use to find the length of the arc of a circle?

The letter tiles shown below are in a bag. whiteout looking i am going to draw one tile. what are my chances of drawing g?

Secant ac and bd intersect at point e inside f what is the measure of aed if measurements cd equals 30 a b is 50 and cb is 170

Find an equation of variation where y varies directly as x and y 75 when x5, findy when x is 1