Roman C. answered • 11/17/12

Masters of Education Graduate with Mathematics Expertise

Do you mean a_{n }= (-1)^{n }* (n+1) ?

In that case, just plug in n=15.

a_{15} = (-1)^{15} * (15+1) = -1 * 16 = -16

Roman C.

a_{3} = (-1)^{3}^{+1}5^{3+1} = (-1)^{4}5^{4
}= 1*625 = 625

Now see if you can compute some other problems with calculating terms in sequences. These two examples should give you the enough of an idea. I assume these are from a textbook. Good Luck!

11/17/12

Grace A.

Thanks! But would it not be -625?

11/17/12

Grace A.

Yes, thanks so much!!

What about this one?

find the 3rd term in the sequence: a

_{n }=(-1)^{n+1}5^{n+1}11/17/12