Plz help ASAP

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Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?

Find two consexutive odd integers such that the sum of their square is 650