Find the missing angles using either the triangle sum theorem (a2+b2=c2) or inverse trigonometric ratios

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11