Find the area of the shaded portion of the figure. Each vertex of square ABCD is at the center of a circle. Leave your answers in terms of π (pi)

Really need on these. i have no idea what to do

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.