math

lexyyyyy:

what is the width of a rectangular prism that is 12 inches high,27 inches long and has a surface area of 1194 square inches? What is the formula

Ok,

You'll have to create a formula.

I'm supposing that you know how to calculate an area of a planar surface, right? high * long = area

To calculate an area of a complete prism, you need have to addition every surface.

(2(12 * 27)) + (2(X * 27)) + (2(X * 12)) = 1194in ²

12*27 + x*27 + x*12 = 1194in ²/2

27x + 12x = 597in ² - 324in ²

39x = 273in ²

x = ??

At this point, you should be able to complete the equation.

NOTE: YOU WILL HAVE A MESURE AND NOT A AREA BECAUSE YOU DIVIDE BY A DIMENSION THAT IS IN INCHES. SO YOU LOOSE THE SQUARE.