In order to calculate the surface area of the given figure, use the following formula:
S = 2wl + 2wh + 2lh
where:
w: width = 7 in
h: height = 3 in
l: length = 4 in
replace the previous values of the parameters into the formula for S:
S = 2(7 in)(4 in) + 2(7 in)(3 in) + 2(4 in)(3 in)
S = 56 in² + 42 in² + 24 in²
S = 122 in²
Hence, the surface area of the given figure is 122 in²