Find the magnitude.Let u = 
. Find the magnitude (length) of the vector: -4u.
A. 100
B. -20
C. 20
D. -20
Answer: C
Mathematics
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Find the average value of the function f over the given region.f(x, y) = 
over the region bounded by 
, 
, 
, and 
.
A. 2 ln 2
B. 50 ln 2
C. ln 2
D. 
ln 2
Mathematics
Rearrange the formulas.F = 
C + 32; solve for C
A. C = 
B. C = 
C. C = 
(F - 32)
D. C = 
(F - 32)
Mathematics
Find the indicated sum. Use the formula for the sum of the first n terms of a geometric sequence.
A. 
B. 
C. 
D. 
Mathematics
Find the average rate of change for the function between the given values.f(x) = -3x2 - x; from 5 to 6
A. -2
B. - 
C. 
D. -34
Mathematics