For the given matrix A, find -A.A = 
A. 
B. 
C. 
D. 
Answer: C
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Using a calculator, solve the following problems. Round your answers to the nearest tenth.A ship is 6 miles west and 46 miles south of a harbor. What bearing should the captain set to sail directly to harbor?
A. N 82.6° E B. N 97.4° E C. N 7.4° E D. N 127.6° E
Use a sum-to-product identity to rewrite the expression.cos 11° - cos 39°
A. -2cos 25.0o cos (-14.0°) B. -2cos 25.0o sin (-14.0°) C. -2sin 25.0° cos (-14.0°) D. -2sin 25.0° sin (-14.0°)
Solve the problem.Let C[0, ?] have the inner product 
= 
and let m and n be unequal positive integers. Prove that cos(mt) and cos(nt) are orthogonal.
A. 
= 
= 
= 
from [0, ?]
= 1.
B. 
= 
= 
= 
from [0, ?]
= 0.
C. 
= 
= 
=
from [0, ?]
= 1.
D. 
= 
= 
= 
from [0, ?]
= 0.
Solve the problem.A tower is supported by a guy wire 
long. The wire makes an angle of 
with respect to the ground, and the distance from the point where the wire is attached to the ground and the tower is 
Approximate the height of the tower to the nearest tenth of a foot.
A. 531.3 ft B. 489.2 ft C. 332.5 ft D. 391.8 ft