Write the sum using summation notation, assuming the suggested pattern continues.

5 - 15 + 45 - 135 + ...

summation of 5 times 3 to the power of n from n equals 0 to infinity
summation of 5 times negative 3 to the power of the quantity n minus 1 from n equals 0 to infinity
summation of 5 times 3 to the power of the quantity n plus 1 from n equals 0 to infinity
summation of 5 times negative 3 to the power of n from n equals 0 to infinity

Question

Write the sum using summation notation, assuming the suggested pattern continues.

5 - 15 + 45 - 135 + ...

 summation of 5 times 3 to the power of n from n equals 0 to infinity
 summation of 5 times negative 3 to the power of the quantity n minus 1 from n equals 0 to infinity
 summation of 5 times 3 to the power of the quantity n plus 1 from n equals 0 to infinity
 summation of 5 times negative 3 to the power of n from n equals 0 to infinity

anonymous · Answer

attachment

anonymous · Answer

I thought it was B but ... i was wrong

alekos · Answer

the sign alternates so it must be either B or D and you've just eliminated B

alekos · Answer

why dont you just substitute values for n and see?

anonymous · Answer

because i didn't understand how to do this one so i guessed tbh

anonymous · Answer

Wanna help on another?

anonymous · Answer

Find the standard form of the equation of the parabola with a focus at (0, 6) and a directrix at y = -6.

 y equals 1 divided by 24 x squared
 y2 = 6x
 y2 = 24x
 y equals 1 divided by 6 x squared

anonymous · Answer

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