Solve the problem.Use the graph of f to estimate the local maximum and local minimum.
A. Local maximum: approx. 3.66; local minimum: approx. -2.55
B. No local maximum; no local minimum
C. Local maximum: 1; local minimum: 4
D. Local maximum: ?; local minimum: -?
Answer: A
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Show that the points form the vertices of the indicated polygon. ? Isosceles triangle: (7, 1), (5, 4), (2, 6) ?
A. Distances between the points: 
B. Distances between the points: 
C. Distances between the points: 
D. Distances between the points: 
E. Distances between the points: 
Find the unknown side. Use a calculator or square root table to approximate square roots to the nearest thousandth.
A. 625 B. 25 C. 17.5 D. 312.5
Find the limit.
cos-1 x
A. 1 B. -1 C. 0 D. ?
Translate the problem to a system of equations, then solve using matrices.Mardi received an inheritance of $70,000. She invested part at 10% and deposited the remainder in tax-free bonds at 8%. Her total annual income from the investments was $6400. Find the amount invested at 10%.
A. $63,600 B. $20,000 C. $40,000 D. $39,000