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If you're talking about #3, then the equation would be 10+12.50h=5+15h.
h will equal 2, and the cost for that number of hours would then be $35.
h will equal 2, and the cost for that number of hours would then be $35.
The standard form of a circle is 
where h and k are the center and x and y are the coordinates you're given. We need to solve for the radius to finish this off correctly. Filling in, we have 
and 
, giving us that 
. Therefore, our equation is 