The general term of a sequence is given. Find the indicated partial sum.an = 5n - 2; S5

A. 85
B. 55
C. 65
D. 100

Answer: C

Mathematics

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Find the work done by F over the curve in the direction of increasing t.F = 4yi + j + (6x + 4z)k; C: r(t) = ti + t2j  + tk, 0 ? t ? 2

A. W =  + 
B. W = 42 + 20
C. W =  + 20
D. W = 0

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Mathematics

Subtract.

A. 94 B. 76 C. 46 D. 56

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Mathematics

Find the unit vector in the direction of the given vector. Write your answer in the indicated form.Let u = -2i - 3j. Find the unit vector in the direction of u, and write your answer as a linear combination of the standard unit vectors i and j.

A.  - i - j
B.  i - j
C. - i - j
D.  i + j

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Mathematics

Simplify.

A.
B. 9x5y2
C.
D.

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Mathematics