Find the distance between (-1, 4) and (1, -1)

Plz me i need i will give a brain

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?