Find the length of the curve.x = 
+ 
from y = 1 to y = 2
A. 
B. 2
C. 
D. 
Answer: D
Mathematics
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A company installs 5,000 light bulbs. The lifetimes of the lightbulbs are approximately normally distributed with a mean of 500 hours and a standard deviation of 100 hours. Find the approximate number of bulbs that can be expected to last the indicated amount of time.More than 740 hours
A. 49 B. 40 C. 499 D. 4960
Mathematics
Solve the problem.If cos A = - 
and sin B = 
, with A and B in quadrant II, then find sin(A + B).
A. 
B. - 
C. 
D. - 
Mathematics
Determine if the vertex of the graph is a maximum point or a minimum point.y = -x2 + 4
A. Maximum B. Minimum
Mathematics
Solve the system by addition. x + 5y = 20 8x + 4y = -20
A. {(5, 6)} B. {(-6, 6)} C. ? D. {(-5, 5)}
Mathematics