Find the standard deviation of the probability density function to the nearest hundredth.f(x) = 3x-4; [1, ?]
A. 0.71
B. 0.87
C. 0.85
D. 0.83
Answer: B
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Determine the symmetries of the curve.r = 6 sin 4?
A. x-axis only B. y-axis only C. x-axis, y-axis, origin D. No symmetry
Solve the problem.Two forces, F1 and F2, of magnitude 60 and 70 pounds, respectively, act on an object. The direction of F1 is 
and the direction of F2 is 
. Find the magnitude and the direction angle of the resultant force. Round the magnitude to the nearest hundredth of a pound and the direction angle to the nearest tenth of a degree.
A. 
= 99.37; ? = 93.7°
B. 
= 92.20; ? = 89.4°
C. 
= 94.63; ? = 87.2°
D. 
= 92.20; ? = 80°
Make the indicated conversion within units of time.Convert 480 minutes to hours.
A. 4 hours B. 8 hours C. 192 hours D. 20 hours
Solve the problem, using simple interest. Round your answer, as needed.Linda Young bought a new computer system. To pay for the system, she borrowed 
from the credit union at 10
% simple interest for 100 days. Find the interest she has to pay.
A. $87.12 B. $81.09 C. $88.87 D. $90.10