A washer and a dryer cost $780 combined. The washer costs $70 less than the dryer. What is the cost of the dryer?

Oh, be very careful about the "$87."

Let the dryer cost x.

Then, the washer costs (x+87)

Together, they cost  (x) + (x+87) = 787

        2x+87 = 787

           2x = 700           [subtract 97 from both sides]

            x = 350             [divide both sides by 2]

The dryer cost $350.

Check:   The washer cost $437.  Together, they cost $787  good to check, right?

Step-by-step explanation:

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0

56 44 2 4

step-by-step explanation: