Write the expression as the sine, cosine, or tangent of an angle.cos 112° cos 45° + sin 112° sin 45°
A. cos 67°
B. sin 67°
C. sin 157°
D. cos 157°
Answer: A
Mathematics
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Solve the initial value problem.Differential Equation: 
= (2 sec 2t tan 2t) i + 
j + t2kInitial Condition: r(0) = 7i + 
j - 5k
A. r(t) = (csc 2t + 6)i + 
j + 
k
B. r(t) = (sec 2t + 6)i - 
j + 
k
C. r(t) = (csc 2t + 6)i + 
j + (t3 - 5)k
D. r(t) = (sec 2t + 6)i + 
j + 
k
Mathematics
Solve the problem.A boat goes 160 mi downstream in the same time it can go 120 mi upstream. The speed of the current is 
Find the speed of the boat in still water.
A. 72 mph B. 63 mph C. 54 mph D. 28 mph
Mathematics
Graph the hyperbola.
- 
= 1
A. 
B. 
C. 
D. 
Mathematics
A strategic alliance is a relationship between firms in which the partners agree to cooperate in ways that provide benefits to each firm.
Answer the following statement true (T) or false (F)
Mathematics