Help with this answer if your cool.

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.

Really need on these. i have no idea what to do

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !