The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport. 
During which hour did the temperature increase the most?
A. 9 a.m. to 10 a.m.
B. 1 p.m. to 2 p.m.
C. 10 a.m. to 11 a.m.
D. 12 p.m. to 1 p.m.
Answer: C
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Divide.0.21 ÷ 0.007
A. 30 B. 3 C. 0.03 D. 0.3
Solve the polynomial inequality and graph the solution set on a number line.x2 + 8x ? 0
A. [0, ?)
B. (-?, -8]
C. [-8, 0]
D. (-?, -8] ? [0, ?)
Factor completely, or state that the polynomial is prime.9x3 - 9x
A. 9x(x2 + 1) B. 9x(x2 - 1) C. x(x + 3)(x - 3) D. 9x(x + 1)(x - 1)
Solve the problem.A television manufacturing company has two factories-I and II-that manufacture color and monochrome TV sets. Each day, factory I produces 50 color and 20 monochrome TV sets at a cost of $3,000. Each day, factory II produces 30 color and 24 monochrome TV sets at a cost of $2,700. An order is received for 2700 color and 1800 monochrome TV sets.(a) Let x and y represent the number of days factory I and factory II must operate, respectively, to fill the order. Give all constraints on x and y in the form of linear inequalities.(b) Write the total daily operating cost as a function of x and y.(c) Graph the feasible set for this problem. 
What will be an ideal response?