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marysya [2.9K]
3 years ago
6

What is the 20th term of the arithmetic sequence?

Mathematics
2 answers:
podryga [215]3 years ago
8 0
You just need to substitute 20 for x and then solve.

a(20) = -5 +(20-1)3

Simplify: a(20) = -5 + (60-3)

Simplify: a(20) = -5 + 57

Result: a(20) = 52

So, 52 is the 20th term of the arithmetic sequence.
Mandarinka [93]3 years ago
8 0
In the equation
a(n) =  - 5 + (n - 1)3
Let n=20 and evaluate it as:

a(20) =  - 5 + (20 - 1)3 \\  \\ a(20) =  - 5 + (19)3 \\  \\ a(20) =  - 5 + 57 \\  \\ a(20) = 52
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