"Nine times the quantity of three less than double a number"

21

Step-by-step explanation:

3×9=27

27-6=21

u do 9× 3 (nine times the quantity of three) is 27 then 3 less then double a number so u take 27 - 3x2= 6 (27-6) an it gives u 21

21

Step-by-step explanation:

9×3=27

3×2=6

27-6=21

i think the answer is b)

step-by-step explanation:

395.84

step-by-step explanation:

2πrh+2πr²

2 (pie)(radius)(height)+2(pie)(radius)^2