Find the inverse of the matrix (if it exists).
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?
A. ?
B. ?
C. ?
D. ?
E. ?
Answer: B
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A helicopter makes a forced landing at sea. The last radio signal received at station C gives the bearing of the helicopter from C as at an N 56.9 ° E altitude of 427 feet. An observer at C sights the helicopter and gives 
as 12.8°. How far will a rescue boat at A have to travel to reach any survivors at B (see the figure)? Round your answer to the nearest ten feet.
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?
?
?
A. 1,620 ft
B. 1,570 ft
C. 1,590 ft
D. 1,580 ft
E. 1,540 ft
Establish the identity.cos 
= -sin x
What will be an ideal response?
Solve the problem.A consumer group in one city compares the costs of goods and services in that city over various years, and uses 1970 as a base. The same goods and services that cost $100 in 1970 cost $37 in 1941. Assume the exponential-decay model in which t is the number of years before 1970. Estimate what the same goods and services cost in 1900. (You will need to find the value of k)
A. $11 B. $1080 C. $8 D. $9
Write the opposite of the polynomial and simplify your result.12a2 - 8a + 2
A. 12a2 - 8a + 2 B. 12a2 + 8a - 2 C. -12a2 - 8a - 2 D. -12a2 + 8a - 2