Question

In an arithmetic sequence,
ai = = 4.5
an=-6.7
d = -0.7
Find the number of terms.​

Answer 1

Answer:

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Answer 2

$\bold{\boxed{Sølutiøn}}$

Given:

a=4.5

an=-6.7

d=-0.7

To find: the number of terms (n)

We know that:

an= a+(n-1)d

=>-6.7=4.5+(n-1)(-0.7)

=> -6.7-4.5=-0.7n+0.7

=> -11.2-0.7= -0.7n

=>-11.9=-0.7n

=>n=11.9/0.7

=>n=17

so, the number of terms is 17

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