Approximate the Sum to the Indicated Accuracy $\sum _ { n = 1 } ^ { \infty } \frac { 4 ( - 1 ) ^ { n - 1 } } { n ^ { 7 } }$

Q80: Use the Integral Test to determine

Q81: Find a power series representation for

Q82: Use the sum of the first

Q83: Find the sum of the series.

Q84: Determine whether the series is absolutely

Q86: Find a power series representation for

Q87: When money is spent on goods

Q88: Determine whether the given series converges

Q89: Test the series for convergence or

Q90: Graph the sequence defined by