Solve the equation.
= 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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If 
, find a formula for 
.
?
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 450 seconds and a standard deviation of 60 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 312 seconds.
A. 0.0107 B. 0.5107 C. 0.9893 D. 0.4893
Mathematics
Multiply.
A. 93,004 B. 92,894 C. 92,914 D. 92,904
Mathematics
Solve the problem.Let Vt be the volume of the tetrahedron bounded by the coordinate planes and the plane 
, and let Ve be the volume of the ellipsoid 
. Find the quotient 
.
A. 4?
B. 8?
C. 
D. 
Mathematics