Suppose your scores on four lab exams were 86%, 82%, 73%, and 78%. According to the syllabus, the average of your five lab scores must be 80% or better to earn a B. Let x represent the percentage on your fifth exam,. Write an inequality to determine possible values of x to guarantee a B grade. Solve your inequality from part a and graph your solution on a number line. Be sure to consider the maximum possible score when writing your solution.