Find a ∩ b if a = {4, 7, 10, 13, 17} and b = {3, 5, 7, 9}.

How many $20 bills do you need to have to make $280

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?