Find the phase shift of the function.y = -3 cos (4x + ?)
A. 
units to the left
B. 
units to the left
C. 4? units to the right
D. 3? units to the right
Answer: A
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Provide an appropriate response.Find the extrema of f(x, y, z) = x + yz on the line defined by x = 5(4 + t), y = t - 5, and z = t + 4. Classify each extremum as a minimum or maximum. (Hint: w = f(x, y, z) is a differentiable function of t.)
A. (10, -7, 2), minimum; (30, -3, 6), maximum B. (30, -3, 6), minimum; (0, -5, 0), minimum C. (30, -3, 6), minimum D. (10, -7, 2), minimum
Simplify the expression. Write the answer using positive exponents.(k6)-7(km)6
A. -k48m6
B. 
C. -k36m6
D. 
Evaluate the expression for the given replacement values.yx, for x = 3 and y = 7
A. 4 B. 343 C. 10 D. 21
Find the exact value of the expression using the provided information.Find cos(s - t) given that cos s = 
, with s in quadrant I, and 
with t in 
A. 
B. 
C. 
D. - 