Select the property of equality used to arrive at the conclusion. if x - 3 = 7, then x = 10

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?