I think I have the answer let me just double check my work okay!
The equation that can be used to determine the dimensions of the base of the doghouse is x² + 4x = 21
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What is the equation?</h3>
A quadratic equation is an equation that usually has a single variable and it is raised to the power of 2.
Area of a rectangle = length x width
x (4 + x) = 21
x² + 4x = 21
To learn more about quadratic equations , please check: brainly.com/question/27696091
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Answer:
21
Step-by-step explanation:
We need to follow PEMDAS
15+3*2
We need to multiply first
3*2 = 6
Then we add
15+6
21
Ok, C is 16 feet below the sea level = -16
D is below the sea level is 1/2 of the elevation of city it's mean
-16 divided 1/2 = -8
Solve: -8 multiply 2 is -16
