9 + 7 + z + z + 5 + 7

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

The life, in years, of a certain type of electrical switch has an exponential distribution with an average life b = 2. if 100 of these switches are installed in dif- ferent systems, what is the probability that at most 30 fail during the first year?

Arectangle is 8cm longer then it is wide, and it’s area is 153cm^2. find the dimensions of the rectangle.