Find the maximum or minimum value of the given objective function of a linear programming problem. The figure illustrates the graph of feasible points. 
z = -x - 9y. Find maximum.
A. maximum: -38
B. maximum: -47
C. maximum: -22
D. maximum: -30
Answer: C
Mathematics
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. (72)-1
A. 
B. - 
C. -14
D. -49
Mathematics
The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport. 
At what time was the temperature its lowest?
A. 4 p.m. B. 9 a.m. C. 6 p.m. D. 1 p.m.
Mathematics
Solve the problem.Kimberly invested 
in her savings account for 7 years. When she withdrew it, she had 
. Interest was compounded continuously. What was the interest rate on the account?
A. 4% B. 3.9% C. 3.8% D. 4.05%
Mathematics
Graph the integrand and use areas to evaluate the integral.
A. 30
B. 45
C. 90
D. 
Mathematics