Find the probability.Assuming that boy and girl babies are equally likely, find the probability that a family with three children has all boys given that the first two are boys.
A. 1
B. 
C. 
D. 
Answer: D
Mathematics
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If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (cos 2t)i + (5 sin t)j
A. a = (-4 cos 2t)i + (-5 sin t)j B. a = (-2 cos 2t)i + (5 sin t)j C. a = (-4 cos 2t)i + (-25 sin t)j D. a = (4 cos 2t)i + (-5 sin t)j
Mathematics
Represent the shaded area in the figure group with an improper fraction.
A. 
B. 
C. 
D. 
Mathematics
Round as indicated.6899 to the nearest ten
A. 6900 B. 7000 C. 6890 D. 6910
Mathematics
Sketch the level curves for the function below for the given c-values 
.
?
?
A. ?
?B. ?
?
C. ?
?
D. ?
?
E. ?
?
Mathematics