Find the exact value by using a sum or difference identity.cos (135° + 120°)
A. 
B. 
C. - 
D. - 
Answer: C
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Solve the problem.The velocity field F of a fluid has a constant magnitude k and always points towards the origin. Following the smooth curve y = f(x) from (a, f(a)) to (b, f(b)), show that the flow along the curve is 
ds = k[(a2 + (f(a))2)1/2 - (b2 + (f(b))2)1/2]
What will be an ideal response?
Find any restricted values for the given rational expression.
A. x = -5, x = - 
, x = 1
B. x = -1, x = 
, x = 5
C. x = -1, x = 
D. x = - 
, x = 1
Simplify by using the order of operations. Round your answer to the nearest hundredth.(-9.4)2 + 1.9 - 8.4
A. 81.86 B. 2.9 C. 8.41 D. 12.3
Solve the problem.From a distance of x feet to a 110-meter-high radio tower, the angle of elevation is ? degrees. Then 
Use a reciprocal identity to rewrite this formula.
A. 110 cot ?
B. 
C. 110 sec ?
D. 