Point r is at (4,1.5) and point t is at (4,2.9) what’s the distance between the two points

Can someone explain to me how to do

Which of these statements is correct? the system of linear equations 6x - 5y = 8 and 12x - 10y = 16 has no solution. the system of linear equations 7x + 2y = 6 and 14x + 4y = 16 has an infinite number of solutions. the system of linear equations 8x - 3y = 10 and 16x - 6y = 22 has no solution. the system of linear equations 9x + 6y = 14 and 18x + 12y = 26 has an infinite number of solutions.

There are 85 apples on the big tree, john picked out 15%. how many did john pick out?