If A=-3 what is a^2 and 3a^2

Which of the following is the rational exponent expression of 6 root f

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$