Can i please get help with these question

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5