Find the indicated partial sum for the given sequence.Find the sum of the first 280 positive integers.

A. 39,340
B. 78,680
C. 39,060
D. 78,400

Answer: A

Mathematics

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Solve the given differential equation. + 3 + 2y = xex - 3

A. y = c₁e^-2x + c₂e^-x + e^x - xe^x -
B. y = c₁e^-2x + c₂e^-x - e^x - xe^x -
C. y = c₁e^-2x + c₂e^-x - e^x + xe^x -
D. y = c₁e^-2x + c₂e^-x + e^x + xe^x -

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Mathematics

The prime factors of 280at2 are:

a. 2 ú 2 ú 7 ú 10 ú a ú t b. 2 ú 2 ú 2 ú 5 ú 7 ú a ú t ú t c. 2 ú 2 ú 2 ú 35 ú a ú t ú t d. 2 ú 2 ú 3 ú 5 ú a ú t ú t e. 2 ú 6 ú 5 ú 7 ú a ú t ú t

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Simplify each side of the equation, if possible. Then solve the equation.3v + -2 = 4v

A. -1 B. 2 C. 1 D. -2

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Use a calculator to find the acute angle ?, to the nearest degree, that satisfies the equation.cos ? = 0.63

A. 51° B. 42° C. 9° D. 1°

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Mathematics