A car leaves four skid marks each 50 feet in length. The drag factor for the road is 0.9. Let x represent the braking efficiency.
a. What is the range of values that can be substituted for x?
b. Let the speed be represented by the variable y and x represent the braking efficiency. Write the skid speed equation in terms of x and y.
c. Graph the skid speed equation using the braking efficiency as the independent variable and the skid speed as the dependent variable.
d. Use your graph to estimate the skid speed for braking efficiencies of 20%, 40%, 60%, 80%, and 100%.