4x-3y=20
2x+y=30
Use the two equations above, solve for y.

Given: tangent if m 1 = 30° and m = 20°, then m = 10 40 80

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?

If a piece of wood with a length of five feet is cut into six equal pieces, what is the length of each piece?