You can buy pens at a rate of $0.75 per pen. how much is it for 400 pens?

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.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Give all possible names for the line shown.calculation tip: lines can be written with either point first.