Solve using Cramer's rule.-3x + 7z = 9-4x + 4y + 5z = 35 5x - 8y = -52
A. (9, 3, 9)
B. (4, -9, -3)
C. (5, 7, 3)
D. (4, 9, 3)
Answer: D
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Solve.A rotating beacon is located a distance d from a long wall. The distance d is given by 
, where t is the time measured in seconds since the beacon started rotating. Solve the equation for t.
A. t = 
arctan 
B. t = 2? arctan 
C. t = 2? tan 
D. t = 
tan 
Find the required part of the geometric sequence.Find the number of terms of a geometric sequence with the first term 3, common ratio -3, and last term 243.
A. 7 B. 6 C. 4 D. 5
Solve the problem.A thermometer reading 
is brought into a room with a constant temperature of 
If the thermometer reads 
after 3 minutes, what will it read after being in the room for 9 minutes? Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt.(Round your answer to two decimal places.)
A. 93.7°F B. 56.3°F C. 70.47°F D. 28.26°F
Multiply and simplify.
? 
A. 5m
B. 
C. 
D. 10