Solve the problem.For the vectors u and v with magnitudes 
= 6 and 
= 8, find the angle ? between u and v which makes 
= 4
A. 48.19°
B. 60.00°
C. 41.81°
D. 41.41°
Answer: A
Mathematics
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Write the integral that gives the surface area generated when the curve is revolved about the x-axis. Do not simplify.y = ln x3 on [1, 
]
A. 
dx
B. 2?
dx
C. 2?
dx
D. 2?
dx
Mathematics
Multiply. Then simplify if possible. Assume that all variables represent positive values.9
? 4
A. 216
B. 1296
C. 36
D. 216
Mathematics
250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Approximately how many students had test scores between 65 and 81.75?
A. 181 B. 147 C. 204 D. 125 E. 85
Mathematics
Without using a calculator, give the exact trigonometric function value with rational denominator.cos 60°
A. 
B. 
C. 
D. 
Mathematics