Question

answer me ASAP pls! ​

Answer 1

Answer:

(D) 265

The answer to this question is rather simple. The key lies in that you will get the answer by substituting 10 in the place of n.

If the sum of n terms =( 5/2)n² + 3n/2 ,

The sum of 10 terms will be = (5/2)10² + 3(10)/2

= 5(100/2) + 30/2

= 500/2 + 15

= 250 + 15

= 265

Therefore, the answer is D) 265

Answer 2

Answer:

d) 265

Step-by-step explanation:

$Sum \: of \: n \: terms = \frac{5}{2} {n}^{2} + \frac{3n}{2} \\ Therefore, Sum \: of \: its \: 10 \: terms = \: n = 10 \\ Therefore, \\ Sum \: of \: 10 \: \:terms = \: \frac{5}{2} \times {10}^{2} + \frac{3(10)}{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{5}{2} \times 100 + \frac{30}{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = (5 \times 50) + 15\\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 250 + 15\\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 265$

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