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Anika [276]
3 years ago
5

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

Mathematics
2 answers:
julia-pushkina [17]3 years ago
8 0

Answer:

c.

15

Step-by-step explanation:

AnnZ [28]3 years ago
7 0

Answer:

Final answer is c. 15

Step-by-step explanation:

We need to find about what is the first term in the sequence for which d = -2 and a7 = 3

We will use nth term formula of arithmetic sequence.

a_n=a+\left(n-1\right)d

we have been given a7 that means 7th term is 3

so plug n=7, d=-2 and a_n=3 into above formula

3=a+\left(7-1\right)(-2)

3=a+6(-2)

3=a-12

15=a

Hence final answer is c. 15

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we have an equation of a straight line. Such an equation is usually written y=mx+b ("y=mx+c" in the UK).

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