How do you say 3 - (-4) as an equivalent sum

John bought 5 lemons and used 2 of them for a salad how much did he use for. a salad . he used % of the lemons.

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?