Step-by-step explanation:
THE ANSWER IS C. 31 INCHES
(88 + 92 + 96 + x) / 4 = 90
(276 + x) / 4 = 90
276 + x = 90 * 4
276 + x = 360
x = 360 - 276
x = 84 <=== he would need an 84
Place the pantomino on 5 numbers they must equal 490 so to check if it would work just add them first if it's not possible explain how it's not possible