What is x +x + x+2 equivalent to

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Evaluate cos2θ for cosθ = square root of 3/2

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