Find the exact value of the expression.cos-1 (1)
A. 0
B. 
C. -?
D. ?
Answer: A
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Graph the integrand and use geometry to evaluate the integral.
A. 200 B. 20 C. 100 D. 50
Solve the following circle graph problems.If entertainment is represented by 72° on a circle graph showing all expenses, and the cost of entertainment is $200, how much are the total expenses?
A. $1,200 B. $800 C. $880 D. $1,000
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 780. Find a linear function, S(t), which fits this data, and which expresses score as a function of time. Use this function to predict an average score for persons taking a 53-hour review course. Round your answer to the tenths place.
A. 726.0 B. 704.7 C. 712.0 D. 716.2
Provide an appropriate response.When using the substitution or elimination method to solve a system of two equations, you end up with an equation stating 
What does this indicate to you about the system of equations?
What will be an ideal response?