Answer:
=4.1d+5.4h−18
Let's simplify step-by-step.
8h−0.9d−18+5d−2.6h
=8h+−0.9d+−18+5d+−2.6h
Combine Like Terms:
=8h+−0.9d+−18+5d+−2.6h
=(−0.9d+5d)+(8h+−2.6h)+(−18)
=4.1d+5.4h+−18
You would round both numbers and subtract. For example 189 can round to 200 and 643 would round to 600. Now just subtract, 600-200=400
Let the initial width, depth and height of the prism be w, d, and h respectively.
surface area of a rectangular prism is 2(w * d + w * h + d * h).
After quadrupling the dimentions, new dimentions is 4w, 4d and 4h.
New surface area is 2(4w * 4d + 4w * 4h + 4d * 4h) = 2(16 * w * d + 16 * w * h + 16 * d * h) = 16 * 2(w * d + w * h + d * h)
Ratio of old surface area to new surface area is 2(w * d + w * h + d * h) : 16 * 2(w * d + w * h + d * h) = 1 : 16
Sorry I don’t know but I tried
