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The start of a sequence is shown below.
By first finding the value of a, find the value of the first term in the
sequence. Give your answer as a decimal.
Rule:
Start at ?
Subtract a then multiply by 4 each time
20
62

Respuesta :

ourwaytoflorida

Answer:

9.5

Step-by-step explanation:

4 (20 - a) = 62

Solving this equation for a:

80 - 4a = 62

4a = 80 - 62

4a = 18

a = 18 / 4

a = 4.5

So, the value of a is 4.5 (not final answer)

we rearrange the sequence rule to:

FirstTerm = (SecondTerm / 4) + a

Substituting the values we have:

FirstTerm = (20 / 4) + 4.5

FirstTerm = 5 + 4.5

FirstTerm = 9.5 (final answer)

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