Help please I've been on this one for a while. How do I solve (1/2)^4 (1/2)^⁻2? The lesson is Multiplying and Dividing Expressions with Exponents.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Bring the fraction a/a-4 to a denominator of 16-a^2

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *