Evaluate the derivative.f(x) = 9 tanh-1(cos x)
A. ln
sin x
B. - 
C. - 
D. - 
Answer: D
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Sketch the vector field in the plane along with its horizontal and vertical components at a representative assortment of points on the circle x2 + y2 = 4.F = 
i + 
j
What will be an ideal response?
Write the following proportions.3 acres is to 4.31 acres as 4.5 acres is to 6.465 acres.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Use percents, percent equations, and/or percent proportions to solve the application.Ms. Robert bought a house five years ago for $220,000. Today it is valued at $210,000. Find the percent decrease in value of the house.
A. 4.8% B. 4.5% C. 2100% D. 95.5%
Solve.It is recommended that there be at least 9.3 square feet of floor space in a classroom for every student in the class. Find the minimum floor space that 33 students require. Round to the nearest tenth if necessary.
A. 28.2 sq ft B. 354.8 sq ft C. 9.3 sq ft D. 306.9 sq ft