Solve the problem.A merchant has coffee worth $30 a pound that she wishes to mix with 30 pounds of coffee worth $80 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used?
A. 60 pounds
B. 75 pounds
C. 150 pounds
D. 120 pounds
Answer: D
Mathematics
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as specified. Leave your answer in polar form.z = 8
w = 3
Find 
.
A. 5
B. 5
C. 
D. 
Mathematics
For the given probability density function, over the stated interval, find the requested value.f(x) = 
, over the interval [2,8]. Find E(x).
A. 5
B. 
C. 10
D. 28
Mathematics
Simplify. Assume that all radicands are nonnegative.
? sin x
A. cos x 
B. cos x 
C. sin x cos x 
D. 
Mathematics
Evaluate the integral.
?
given,
,
,
,
.
?
A. -66
B. -2377
C. -2025
D. 12
E. -369
Mathematics