The probability density function for the life span of an electronics part is 
where t is the number of months in service. Find the probability that any given part of this type lasts longer than 18 months. Round your answer to three decimal places.
?
A. 0.487
B. 0.513
C. 0.532
D. 0.497
E. 0.468
Answer: A
Mathematics
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A. v = (csc2 t)i + (cot t csc t)j B. v = (-sec2 t)i - (tan t sec t)j C. v = (sec2 t)i + (tan t sec t)j D. v = (-csc2 t)i - (cot t csc t)j
Mathematics
Find a formula for the nth partial sum of the series and use it to find the series' sum if the series converges.5 + 
+ 
+ ... + 
+ ...
A. 
; 
B. 
; 
C. 
; 
D. 
; 
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The following figure has perimeter, circumference, or area as indicated. Find the value of x. Use 3.14 as an approximation for ?.P = 68
A. 8.5 B. 17 C. 8.25 D. 34
Mathematics
Graph the line whose equation is given.y = 
x - 3
A. 
B. 
C. 
D. 
Mathematics