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3 years ago

6

/////I need help fast/////

1 answer:

gladu [14]3 years ago

5 0

A(4) =13

a(1) = 1
a(2)=5
a(3)=9
a(4)=13
a(5)=17

So, the arithmetic formula is: a(n) = a(n-1) + d

If we look at the formula, the numbers change by +1, which is our d

We can test our formula by look for 2,
a(2)= a(2-1)+4
a(1)+4
1+4

a(2)=5

Even though the sequence tells us, we can test our formula anyhow

a(4)= a(4-1)+4
a(3)+4
9+4

a(4)=13

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