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Zanzabum
3 years ago
9

WILL MARK BRAINLIST!!!!!!!!!!!!

Mathematics
1 answer:
Semmy [17]3 years ago
4 0

Answer:

T_{21} = 53

Step-by-step explanation:

Given

a = -7

d = 3

Required

Determine T_{21}

This is calculated using sum of Ap formula

T_n = a + (n - 1)d

In this case:

n =21

So, the equation becomes

T_{21} = -7 + (21 - 1) * 3

T_{21} = -7 + 20 * 3

T_{21} = -7 + 60

T_{21} = 53

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