I need help with 1-5 a - c PLS

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.