Solve.2x - 4 = 
A. x = 5
B. x = 9
C. x = -5
D. x = 37
Answer: D
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Write a chain rule formula for the following derivative.
for u = f(r, s, t); r = g(y), s = h(z), t = k(x, z)
A. 
= 
B. 
= 0
C. 
= 
D. 
= 
Solve the problem.If f(x, y) = (4,000ey)/(1 + 
/2) represents the population density of a planar region on Earth, where x and y are measured in miles, find the number of people within the rectangle -9 ? x ? 9 and -4 ? y ? 0.
A. 8,000(1 - e-4) ln 
? 13,388
B. 4,000(1 - e-4) ln 
? 6,694
C. 8,000(1 - e-4) ln 5 ? 18,832
D. 16,000(1 - e-4) ln 
? 26,776
Fine the requested unknown measure.A box has a volume of 79,500 in.3. If the length is 75 in. and the height is 
find the width.
A. 48 in. B. 53 in. C. 72 in. D. 60 in.
Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 1
B. 
C. 
D. 