Find the indicated series by the given operation.Find the first three terms of the expansion for f(x) = ex cos x by multiplying the proper expansions together, term by term.

A. x - x2 +  x3 - . . .
B. x + x2 -  x3 + . . .
C. 1 + x -  x3 - . . .
D. 1 + x -  x2 - . . .

Answer: C

Mathematics

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Solve.t2 - 2t - 15 ? 0

A. (-?, -3] ? [5, ?), or {tt ? -3 or t ? 5}
B. [5, ?), or {tt ? 5}
C. (-?, -3], or {tt ? -3}
D. [-3, 5], or {t-3 ? t ? 5}

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Solve the problem.Using a phone card to make a long distance call costs a flat fee of $0.88 plus $0.25 per minute starting with the first minute. What is an equation of the form  for this situation?

A. y = 0.88x + 0.25 B. y = 0.25x + 0.88 C. y = 0.25x D. y = 0.88x

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Find an equation for the ellipse described.Center at (0, 0); focus at (0, 5); vertex at (0, 7)

A.  +  = 1
B.  +  = 1
C.  +  = 1
D.  +  = 1

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Solve.5x - 3 + 6x - 9 = 4x + 7x - 15

A. Infinite number of solutions B. No solution C. x = 0 D. x = 192

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Mathematics