answer this pls and answer the right answer
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Step-by-step explanation:
7) x = -1
then 3x^2 = 3(-1)^2
= 3
8) 5^6 * 5^2x = 5^10
5^(6+2x) = 5^10
bases are equal then powers are equal
6 + 2x = 10
2x = 10 - 6
x = 4/2
x = 2
9)area = 1/2 * breadth * height
= 1/2 * 8 * 5
= 40/2
= 20sqcm
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