1. The percent of the U.S. population covered by an employment-based health insurance plan can be approximated by the expression
- 0.75x + 63.8
where x is the number of years past 2000. Use this expression to estimate the percent covered by such a plan in the year 2015?
2. The expression for the speed of blood through an artery of radius r at a distance x from the artery wall is given by r2 - (r - x)2. Evaluate this expression when r = 5 and x = 2?