4. (/ pt.) Calculate a basic dose response for each of the cases below for the following relationships assuming that the exposure level is 50 parts per million and the effect is measured as the added risk of one more human death per year. Linear: Y = 1/10,000 X Linear with threshold: Y = -1/10 + 1/10,090 X Non Linear. Y = 1/1,000 In X Linear, No Threshhold Linear, Positive Threshold Non-Linear, No Threshhold Effect Effect Effect Exposure Exposure Exposure parts per million Threshhold parts per million parts per million