The height of the carton of oatmoatmeal is 9 inches.
Explanation:
Radius = 4 inches
Area of cardboard used = 276 square inches
Required surface area = π(r x r) + 2πrh
276 = π(4 x 4) + 2π(4 x h)
276 = 16π + 8π(h)
276 = 50.24 + 25.12(h)
276 - 50.24 = 25.12(h)
225.76 = 25.12(h)
(225.76) /(25.12) = h
h = 9 inches
The height of the carton of oatmoatmeal is 9 inches.