For each formula, describe the four quantities. Then explain how you can find the fourth quantity if you know the values of the other three. A) an=a1 + (n-1) d B) sn= n/2 ( a1-an) C) an=a1r ^ n-1 D) Sn = a1 ( 1-r^n) / 1-r

Question

For each formula, describe the four quantities. Then explain how you can find the fourth quantity if you know the values of the other three.  A) an=a1 + (n-1) d  B) sn= n/2 ( a1-an)  C) an=a1r ^ n-1  D) Sn = a1 ( 1-r^n) / 1-r

anonymous · Answer

If anyone is able to solve this, I will be in your debt.

anonymous · Answer

@iambatman plz help

anonymous · Answer

@abb0t , @mathstudent55 , @dan815

abmon98 · Answer

a) In an Arithmetic Sequence the difference between one term and the next is a constant.
a is the first term, d is the common difference and n would be the number of terms in which you plug in 4.
b) is the formula of the arithmetic sequence, in an arithmetic sequence is going from one number by a common difference, when we sum a number of term we take the number of term*the first term + the last term divided by 2. n(a1+an)/2.
c) geometric series, is a series where each successive term is the previous multiplied by a fixed value(common ration r).  a, ar, ar^2, ar^3
d) we can find the sum of geometric series using the formula Sn=a(r^n-1)/r-1

anonymous · Answer

Thank you so much.

abmon98 · Answer

your most welcome :D