Slope and the y-intercept for y=9x-9

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?