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3 years ago

Can someone help please

Mathematics

1 answer:

irina [24]3 years ago

4 0

Answer:

a) an = 12 -2(n -1)

b) an = 25 -5(n -1)

Step-by-step explanation:

The n-th term of an arithmetic sequence is given by ...

an = a1 +d(n -1) . . . . . first term a1, common difference d

The first term is a1 = 12; the common difference is d = 10 -12 = -2.

The n-th term is ...

an = 12 -2(n -1)

The first term is a1 = 25; the common difference is d = 20 -25 = -5. The n-th term is ...

an = 25 -5(n -1)

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