Express the interval in set builder notation and graph the interval on a number line.(-?, 6.5]
A. {
x ? 6.5}
B. {
x > 6.5}
C. {
x ? 6.5}
D. {
x < 6.5}
Answer: C
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Find the principal unit normal vector N for the curve r(t).r(t) = (t2 + 3)j + (2t - 8)k
A. N = - 
j + 
k
B. N = 
j - 
k
C. N = - 
j + 
k
D. N = 
j - 
k
Form the negation of the statement.Copenhagen is not the capital of Iran.
A. It is true that Iran is not the capital of Copenhagen. B. It is true that Copenhagen is not the capital of Iran. C. It is not true that Copenhagen is not the capital of Iran. D. It is not true that Iran is not the capital of Copenhagen.
Find the indicated sum.
A. -18 B. -2 C. -20 D. -8
The standard deviation for a random variable with probability density function f and mean ? is defined 
Find the standard deviation for an exponential density function with mean 10.
a. 3.3 b. 2 c. 5 d. 2.5 e. 10