Find the exact value of the expression.cos (30° + 45°)
A. 
B. 
C. 
D. 
Answer: A
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Convert the temperature, as indicated. Round your answer to hundredths, if appropriate.100°F, into Celsius
A. 37.78°C B. 122.40°C C. 68.00°C D. 55.56°C
Find the x-intercepts of the polynomial function. State whether the graph crosses the x-axis, or touches the x-axis and turns around, at each intercept. f(x) = -x2(x + 9)(x2 + 1)
A. 0, touches the x-axis and turns around; 9, crosses the x-axis B. 0, touches the x-axis and turns around; -9, crosses the x-axis; -1, touches the x-axis and turns around C. 0, touches the x-axis and turns around; -9, crosses the x-axis D. 0, touches the x-axis and turns around; -9, crosses the x-axis; -1, crosses the x-axis; 1, crosses the x-axis;
Solve the problem.The daily profit in dollars of a specialty cake shop is described by the function 
where x is the number of cakes prepared in one day. The maximum profit for the company occurs at the vertex of the parabola. How many cakes should be prepared per day in order to maximize profit?
A. 28 cakes B. 56 cakes C. 784 cakes D. 2352 cakes
Use the substitution method to solve the system. y = 13 - 3x2x + 9y = -8
A. (5, -2) B. (5, 2) C. (-5, -2) D. (-5, 2)