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slamgirl [31]
3 years ago
6

The first term in an arithmetic sequence is 9 and the tenth term is 45. Use the first and tenth terms to find the sun of the fir

st 10 terms. The equation of the sequence is an=4n+5
Mathematics
1 answer:
PtichkaEL [24]3 years ago
5 0

Answer:

270.

Step-by-step explanation:

If the first term = a and 10th term = a + 9d where d = the common difference.

a + 9d - a = 45 - 9

9d = 36

d = 4.

Sum of first 10 terms = (10/2)[2*9 + (10-1)*4]

= 5 * (18 + 36)

= 5 * 54

= 270.

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<h3>What is pH value?</h3>

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brainly.com/question/1503669

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