Find the geometric mean between 3 and 12

Astudent simplified a rational expression as shown.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

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