I think you do 90-42 which is 48.
Next, do 48/6 and you get....
8
8 is the final answer.
Surface area of one face = 9x9 = 81
total no. of faces = 6
total surface area of prism = 81 x 6 = 486in.
-3m>26-5
-3m>21
m>21/(-3)
m<-7=>m∈(-∞, -7)
-3 is negative and dividing an inequality by something negative switches its sign, that's why I wrote < instead of >
M= - 7/4 I think this is the answer