Lightning strikes the earth 1000 times every ten seconds. how many seconds does it take forr it to strike 7250 times?

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.

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

How can you tell when x and y are not directly proportional?