How are circles and cylinders related?

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?