Solve the problem.Suppose that z varies jointly with x and y and that z = 22.5 when x = 9 and 
Find the constant of proportionality k. Then, find z when x = 5 and 
A. k = 0.3; z = 13.5
B. k = 1012.5; z = 
C. k = 0.5; z = 22.5
D. k = 5; z = 225
Answer: C
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Solve.A factory producing nuts and bolts produces the following number of bolts: Monday: 6,742 Tuesday: 9,837 Wednesday: 10,471 Thursday: 8,153 Friday: 12,477 How many bolts did the factory produce that week?
Fill in the blank(s) with the appropriate word(s).
Solve the problem.Consider a retirement savings account where the monthly contribution is $175 for the first 20 years, is increased to $225 for the next 5 years, and then is increased once again to $375 for the last 15 years. The APR is always 4.8% compounded monthly. What is the value of the account at the end of 40 years? Round your answer to the nearest cent.
A. $310,143.23 B. $314,907.23 C. $313,040.67 D. $312,009.78 E. $315,938.12
Solve the problem.The mathematical model 
represents the cost in dollars a company has in manufacturing x items during a month. How many items were produced if costs reached $380,000?
A. 379,600 items B. 650 items C. 1100 items D. 800 items
Solve the equation.
= 
A. - 1 B. 4 C. No solution D. 8