Question

If a=5, t10= 20, n= 10 then S10=... *​

Answer 1

Step-by-step explanation:

The answer is in the pic

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Answer 2

$Sn \: = \frac{n}{2} {2a + (n - 1)d} \\ \\Sn = \frac{10}{2} {2 \times 5 + (10 - 1)20} \\ \\ = 5 \: (10 + 9 \times 20) \\ \\ 5(10 + 180) \\ \\ 5 \times 190 \\ \\ </p><p></p><p> S10=950$