What is the square root of 138

Me what is the value of x? showing work would be appreciated - ! : )

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

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