the sum of an infinite geometric series is 20, and the common ratio is 0.2. Find the first term of this series

a₁ = 16

Step-by-step explanation:

The sum to infinity of a geometric series is

S ∞ =

where a₁ is the first term and r the common ratio , then

= 20

= 20 ( multiply both sides by 0.8 to clear the fraction )

a₁ = 0.8 × 20 = 16

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there are two angles that are alternate interior angle with angle 9

the angle 15 and angle 7 are alternate interior angle with angle 9.

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