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jeka94
3 years ago
13

What is the first term in the sequence for which d = -2 and a7 = 3?

Mathematics
1 answer:
lana66690 [7]3 years ago
7 0

Answer:

First term is 15

Step-by-step explanation:

Given data:

a_{7} =3\\d=-2

Now,

a+6d=3.....(1)\\a_{n} =a+(n-1)d\\\\\\From equation (1)\\a+6(-2)=3\\a-12=3\\a=12+3\\a=15

Therefore first term a =15

Correct option is (c)

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3 years ago
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