What’s the awnser?

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.