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Leni [432]
3 years ago
5

Can someone help? Solve for x

Mathematics
2 answers:
Luba_88 [7]3 years ago
8 0
The answer is A) x = 9

We know this because every four sided figure has angles that measure up to 360. So we can subtract all of the angles and then use the remaining angle to solve the problem. 

360 - 90 - 90 - 99 = 81. 

So with the remaining angle being 81, we can solve for x. 

x^2 = 81
x = +/-9 

Since +9 is the only answer that makes sense in this case, x = 9. 
olasank [31]3 years ago
7 0
In quadrilateral sum of all angles =360⁰.
m∠A+m∠B+m∠C+m∠D = 360
90+99+x²+90= 360
x²=81
x=√81
x=9
Answer is A.9.
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When the monthly cost is equal, both equations would be equal: 7.5x = 5.5x + 10

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