If a test is worth 90 points and I got 12/15 questions right then what would my grade be?

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

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

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?