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

answer: .75 km

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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