college
posted by ashley .
The average number of radioactive particles passing through a counter during 1 millisecond in a lab experiment is 4. What is the probability that more than 2 milliseconds pass between particles?

One side of a triangle is three times the shortest side. The third side is 7 feet more than the shortest side. The perimeter is 62 feet. Find all three sides.

x= shortest side
3x= side one
x+7 = third side
then you add all these together and set them equal to 62 and solve for x.