Please help me and thank you formula A= 1/2 (b) (h)

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.

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Find the distance between (7,-6) and (-3,-9)