Use the formula for the general term (the nth term) of an arithmetic sequence to find the indicated term of the sequence with the given first term, a1, and common difference, d.Find a21 when a1 = 2, d = - 1.
A. - 19
B. - 18
C. 23
D. 22
Answer: B
Mathematics
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Find the value of the probability of the standard normal variable Z corresponding to the shaded area under the standard normal curve. Round your answer to four decimal places.
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Fill in the blank(s) with the appropriate word(s).
Mathematics
Multiply, and then simplify if possible. Assume all variables represent positive real numbers.
(
+ 
)
A. 
+ 
B. 
C. 8
D. 7
+ 7
Mathematics
Solve the equation.x - 
= 4
A. {-1} B. {1, 2} C. {9} D. {2, 9}
Mathematics
Evaluate the expression for the given values. Expression your answer as a fraction unless otherwise indicated.3x + 8y + 1; x = 2, y = 5
A. 44 B. 15 C. 47 D. 32
Mathematics