Find the exact value of the expression.cos-1 (1)

A. 0
B.
C. -?
D. ?


Answer: A

Mathematics

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Graph the integrand and use geometry to evaluate the integral.

A. 200 B. 20 C. 100 D. 50

Mathematics

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

Mathematics

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

Mathematics

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?

Mathematics