What is the Radius? please help

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.