The average length of time that a customer waits in line for service is ,  where y is the average arrival rate, written as the number of customers per unit of time, and x is the average service rate, written in the same units. Evaluate

class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_33a40dbec9954c4b84ea55336" />. Note:x and y are given as the number of customers per hour.
?

A. 27 min
B. 20 min
C. 13 min
D. 17 min
E. 23 min

---

Answer: B

Mathematics

Find the value of the objective function at each corner of the graphed region. Use this information to answer the question.Objective Functionz = x + 10yWhat is the maximum value of the objective function?

A. 130 B. 95 C. 150 D. 116

Use the rules for exponents to rewrite the expression and then evaluate the new expression. 42 ? 45

A. 262,144 B. 16,777,216 C. 16,384 D. 1,048,576

Graph the system of inequalities. Shade the region that represents the solution set.x2 + y2 ? 81x + y > 4

A.

B.

C.

D.

If the total revenue function for a blender is , determine how many units x must be sold to provide the maximum total revenue in dollars. ??

A.
B.
C.
D.
E.