What is the total surface area of the rectangular pyramid below.? (The net of the figure is also given to help if needed)

A rectangular pyramid. The rectangular base has a length of 18 feet and width of 10 feet. 2 triangular sides have a base of 18 feet and height of 14.1 feet. 2 triangular sides have a base of 10 feet and height of 16 feet.

a
386.9 square feet
b
593.8 square feet

c
639.4 square feet

d
1,053.2 square feet

Let the first number be "x" and the second one "y"

Three times the first number is "3x" and five times the second number is "5y" and some of these is equalt to 54. So,

3x + 5y = 54

And if the second number is two less than the first, that means if we add 2 to the second number it will be equal to the first one, meaning ;

x = y+2

Now we have a system of equations. Let's solve.



From the second equation we have x's value. Will plug it in the first equation.



Now we have y's value. Let's plug it in one of the equations to find x.



So, (x, y) = (8, 6)

Answer is (8,6)