Find the largest open interval where the function is changing as requested.Decreasing f(x) = 
A. (-8, ?)
B. (8, ?)
C. (-?, -8)
D. (-?, 8)
Answer: D
Mathematics
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Calculate the arc length of the indicated portion of the curve r(t).r(t) = 
t3/2i + (7t sin t)j + (7t cos t)k ; -4 ? t ? 5
A. 294 B. 150.5 C. 94.5 D. 126
Mathematics
Solve the following system by any appropriate method. If there is no real number solution, so state.xy = 12012y - 12x = 24
A. (-12, 10), (10, -12) B. (12, 10), (-10, -12) C. (-12, -10), (10, 12) D. no real solution
Mathematics
Perform the operation and reduce to lowest terms.2
× 14
A. 28
B. 30
C. 16
D. 196
Mathematics
Simplify the expression. Express the answer so that only positive exponents occur. Assume that all variables are positive.(27x6y6)1/3
A. 3x2y2 B. 3x6y2 C. 3x2y D. x2y2
Mathematics