Answer:

Step-by-step explanation:
![\displaystyle -2[5] + 5 = -10 + 5 = -5](https://tex.z-dn.net/?f=%5Cdisplaystyle%20-2%5B5%5D%20%2B%205%20%3D%20-10%20%2B%205%20%3D%20-5)
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Answer:
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Answer: 3^2 * 3^8
Step-by-step explanation: 3^(4-2) * 3^(5+3)
Answer:
127°
Step-by-step explanation:
The sum of the interior angles of a polygon is
sum = 180°(n - 2) ← n is the number of sides
here n = 5 ( Pentagon), hence
sum = 180° × 3 = 540°
To find the fifth angle subtract the sum of the 4 given angles from 540
angle = 540° - (156 + 72 + 98 + 87) = 540° - 413° = 127°
5 is the mean of variable a I might be wrong