Find the sum.Find the sum of the first 20 terms of the arithmetic sequence: -12, -21, -30, -39, . . .
A. -2040
B. -192
C. -1950
D. -1942
Answer: C
Mathematics
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For the curve r(t), write the acceleration in the form aTT + aNN.r(t) = 
i + 
j + 12tk
A. a = 
T
B. a = 25T + 25N
C. a = T + 25N
D. a = 
N
Mathematics
Find the limit.
A. - 
B. Does not exist
C. - 
D. 0
Mathematics
Multiply and simplify. Assume that all variables represent positive real numbers.(3 + 
)(2 + 4
)
A. 18 + 14
B. 18 + 6
C. 60
D. 6 + 18
Mathematics
Simplify the expression. Express the answer so that all exponents are positive. Whenever an exponent is 0 or negative, we assume that the base is not 0.
-1
A. 
B. 
C. 
D. 
Mathematics