What is the surface area of a 5,9,10 inch prism

5 x 9 = 45

thats the area of one of the sides, and since the opposite side is identical, it's also 45

so mulitply 45 by 2, you get 90

then do 5 x 10, you get 50

multiply that by 2 and you get 100

finally, 9 x 10 = 90

90 x 2 is 180

so now add the final numbers

90 + 100 + 180 is 370.

the surface area is 370 square inches