What is the answer? What are a b and c and what are the x’s

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

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2