Use properties of logarithms to expand the logarithmic expression as much as possible. Where possible, evaluate logarithmic expressions without using a calculator.log2
A. 5log2x - 8log2y
B. 8log2y - 5log2x
C. 5log2x + 8log2y
D. 
log2
Answer: A
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For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (9 sin 
t + 7)i + (9 cos 13t) - 6)j + 5tk; osculating plane at t = 0.5?.
A. 
(y + 6) + 9
= 0
B. 
(x - 7) + 9
= 0
C. 
(y + 6) + 9
= 0
D. 
(y - 6) + 
= 0
Solve the problem.A solid of constant density is bounded below by the plane 
above by the cone 
and on the sides by the cylinder 
Find the center of mass.
A. (0, 0, 
)
B. (0, 0, 
)
C. (0, 0, 
)
D. (0, 0, 
)
Determine if the given value is a solution to the equation.10
8n - 7 = 73
A. Yes B. No
Translate the problem to a system of equations; then solve using the elimination method.Anne and Nancy use a metal alloy that is 16.4% copper to make jewelry. How many ounces of an alloy that is 10% copper must be mixed with an alloy that is 21% copper to form 110 ounces of the desired alloy?
A. 46 ounces B. 69 ounces C. 48 ounces D. 64 ounces