Find the intervals on which the function is continuous.y = 
A. (-?, 2), (2, 6), (6, ?)
B. (-?, -6), (-6, 2), (2, ?)
C. (-?, -2), (-2, 6), (6, ?)
D. (-?, 2), (2, ?)
Answer: A
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Calculate the arc length of the indicated portion of the curve r(t).r(t) = 
t3/2i + (10t sin t)j + (10t cos t)k ; -3 ? t ? 5
A. 360 B. 190 C. 240 D. 160
Find the gradient ?f.f(x, y, z) = xyz ln (x + y)
A. yz ln (x + y)i + xz ln (x + y)j + 
k
B. 
i + 
j + 
k
C. 
i + 
j + xy ln (x +y)k
D. 
i + 
j + z ln (x + y)k
Write the standard form of the equation of the circle whose radius is r and whose center is (h, k).r = 
; (h, k) = (-8, -6)
A. (x - 8)2 + (y - 6)2 = 13 B. (x + 6)2 + (y + 8)2 = 169 C. (x - 6)2 + (y - 8)2 = 169 D. (x + 8)2 + (y + 6)2 = 13
Solve the problem.Last month, a company sold 312 video games. This month, the company sold 300% of that amount. How many were sold this month?
A. 300 B. 9,360,000 C. 936 D. 312