Step-by-step explanation:
The dimensions of the cuboid are 5 cm, 7 cm and 9 cm.
The formula for the surface area of the cuboid is as follows :
[tex]A=2(lb+bh+hl)[/tex]
We have,
b = 9 cm, l = 7 cm and h = 5 cm
So,
[tex]A=2(9\times 7+9\times 5+7\times 5)\\\\A=2\times 143\\\\A=286\ cm^2[/tex]
Jamie forgets to multiply 143 by 2 as the formula for surface area contains 2 as well.
