Question 977673
Hi there,
Formula for Sum to Infinity = a/(1 - r)
 
a(1) = -4  r = 1/4
 a)  Sum = -4/(1 - 1/4) = -4/(3/4) = -5.33 (2 decimal places)
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a(1) = 24  r = 1/6
 b)  Sum = 24/(1 - 1/6) = 24/(5/6) = 28.8

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Hope this helps :-)