Answer:
4
Step-by-step explanation:
7(2m+3)-5m=2(4m+8)+9
14m+21-5m=8m+16+9
14m-5m-8m+21=16+9
9m-8m+21=25
m+21=25
m=25-21
m=4
The surface area of the provided figure is 1051.2 square ft after calculating the area separately.
<h3>What is the area of the rectangle?</h3>
It is defined as the area occupied by the rectangle in two-dimensional planner geometry.
The area of a rectangle can be calculated using the following formula:
We have given a three-dimensional figure with dimensions.
The surface area = area of seven rectangles + area of two triangle
= 15×9 + 2(15×12) + 2(9×12) + 2(9×15) + 2(1/2)[9(19.8-12)]
= 135 + 360 + 216 + 270 + 70.2
= 1051.2 square ft
Thus, the surface area of the provided figure is 1051.2 square ft after calculating the area separately.
Learn more about the rectangle here:
brainly.com/question/15019502
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