Solve the problem and answer the question.A painter can finish painting a house in 8 hours. Her assistant takes 10 hours to finish the same job. How long would it take for them to complete the job if they were working together?
A. 4
hr
B. 
hr
C. 9 hr
D. 7 hr
Answer: A
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Solve the problem.Suppose that P dollars is invested in a savings account at an annual interest rate i, compounded monthly, for 2 months. The amount A in the account after 2 months is given by 
.Multiply this expression for A.
A. A = 
i2 + 
i + P
B. A = 
i2 + P
C. A = 
i2 + 
i + P
D. A = 
i2 + 
i + P
Provide an appropriate response.When using the substitution or addition method to solve a system of two equations, you end up with an equation stating 0 = 0. What does this indicate to you about the system of equations?
What will be an ideal response?
Add.
+ 
A. - 
B. 
C. - 
D. 
Solve the problem.Two low-frequency sound waves with similar frequencies, producing the pressures 
and 
combine to form a pressure P = P1 + P2. The variable t is time measured in seconds. Graph P in 
by 
and use the graph to determine the frequency of the displayed beats.
A. 4 beats/sec B. 11 beats/sec C. 8 beats/sec D. 15 beats/sec