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harina [27]
3 years ago
8

Solve for x A) 8 B) 10 C) -11 D) 5

Mathematics
2 answers:
hodyreva [135]3 years ago
6 0
Answer: A)8


Since the angle that equals 80 degrees is the same as the angle that equals 9x+8 that means you have 9x+8=80

9x+8=80
-8 -8
9x=72
- -
9 9
X=8
BartSMP [9]3 years ago
3 0
A) 8

80=9x+8
Minus 8 on each side
72=9x
Divide each side by 9
8=x
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Answer:

C

Step-by-step explanation:

the total surface area of such a pyramid is the sum of 5 areas :

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now, we know the baseline of the 4 triangles, but what is their height (at least we know, all 4 have the same height, as the pyramid is totally regular) ?

the height of the side triangles is the slant height of the pyramid (the distance from the middle of a sideline to the top of the pyramid).

we get this by imagining a right-angled triangle inside the pyramid :

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and the baseline (Hypotenuse) is the slant height of the pyramid.

we can use Pythagoras

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slant height² = 7² + (8/2)² = 49 + 4² = 49 + 16 = 65

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Alenkinab [10]
The answer would be $21.5 less than the original.
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