Find the least value for n for which sn is greater than 163.
a1 = 4, r = .98

  n = 84

Step-by-step explanation:

The sum is given by the formula ...

  Sn = a1·(1 -r^n)/(1 -r)

We can fill in the given values and solve for n.

  163 = 4(1 -0.98^n)/(1 -0.98)

  163·0.02/4 = 1 -0.98^n

  0.98^n = 1 -0.815

  n·log(0.98) = log(0.185)

  n = log(0.185)/log(0.98) ≈ 83.52

A value of n=84 will give a sum greater than 163.

S84 ≈ 163.3545

S83 ≈ 162.6067

b

step-by-step explanation:

if a was wrong then it has to be b it cant be c either because not all the y intercepts are the same!

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