Evaluate the expression for x = -2, y = 3, and z = -4. Make sure you simplify.3y - 6z2
A. -39
B. -15
C. 105
D. -87
Answer: D
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = 
i + 
j + 4tk
A. T = 
(cos 0.375t)i - 
(sin 0.375t)j + 
k ; N = (-sin 0.375t)i - (cos 0.375t)j
B. T = 
(cos 0.375t)i - 
(sin 0.375t)j + 
k ; N = (-sin 0.375t)i - (cos 0.375t)j
C. T = 
(sin 0.375t)i - 
(cos 0.375t)j ; N = (-sin 0.375t)i - (cos 0.375t)j
D. T = 
(cos 0.375t)i - 
(sin 0.375t)j ; N = (-sin 0.375t)i - (cos 0.375t)j
Subtract. Write a mixed numeral for the answer.
A. 12
B. 12
C. 12
D. 13
Find the probability.The table lists the eight possible blood types. Also given is the percent of the U.S. population having that type.
Let E be the event that a randomly selected person in the U. S. has type B blood. Let F be the event that a randomly selected person in the U. S. has RH-positive blood.Find P(F|E).
A. 0.818 B. 0.340 C. 0.720 D. 0.107
Perform the indicated operation where possible.
+ 
A. 
B. 
C. 
D. 