Select the number line that shows that two opposite numbers have a sun of 0

Which statement is always true? a negative exponent cannot be part of an expression's numerator. a negative base raised to the power of 2 has a negative value. a negative base raised to the power of 2 has a positive value. any number to the first power is zero.

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If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package