1) (-7/10) ^1 = -7/10
2) (-2/5)^3 = -2/5 * -2/5 * -2/5 = (-2)^3 / (^5)^3 = -8/125
3) (-2/3)^4 = -2/3 * -2/3 * -2/3 * -2/3 = (-2)^4 /(3)^4 = 16/81
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1) (-7/10) ^1 = -7/10
2) (-2/5)^3 = -2/5 * -2/5 * -2/5 = (-2)^3 / (^5)^3 = -8/125
3) (-2/3)^4 = -2/3 * -2/3 * -2/3 * -2/3 = (-2)^4 /(3)^4 = 16/81