The questions are below

So, when ever you need to multiply or divide exponents, and if the base is the same, you can just add or subtract the exponents:

a) 3^2 * 3^2 = 3^2+2 = 3^4 = 81

b) 7^1 * 7^4 = 7^1+4 = 7^5 = 16807

c) 10^9 / 10^7 = 10^9-7 = 10^2 = 100

d) 5^8 / 5^1 = 5^8-1 = 5^7 = 78125

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5+2x=a

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i think the amount would be $140.62