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erik [133]
3 years ago
11

PLEASE HELP ME GUYS!!

Mathematics
1 answer:
Softa [21]3 years ago
8 0

Answer:

n=20

Step-by-step explanation:

S_{n} =\frac{n(a_{1}+a_{n})}{2}\\\\1260 =\frac{n(25+101)}{2} \\\\n = 20

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Genrish500 [490]
The answer for this problem is that x = 60°, or B. 

We can solve this problem by using our knowledge of quadrilaterals. In this problem, we need to know that the number of degrees in a quadrilateral is equal to 360, but, the formula to find the number of degrees in a polygon with n sides is (n-2) * 180. 

Now that we know that the sum of the angles if 360°, we can add all the angles and solve for x. The angles with the squares are 90°. 

2x° + x° + 90° + 90° = 360°

Get x by itself, combine like terms. 

3x° + 180° - 180° = 360° - 180°
3x° = 180°
x = 60°, or B.
4 0
4 years ago
Read 2 more answers
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cestrela7 [59]

Answer:

Step-by-step explanation:

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6 0
3 years ago
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MaRussiya [10]
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8 0
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Step-by-step explanation:

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