jgandarilla21
03.12.2020 •
Mathematics
Help, ima super dumb
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Ответ:
Sum of the first 20 terms = 1510
Step-by-step explanation:
a₂₀ = 7*20 + 2 = 142
This is an Arithmetic progression, a = 9, last term = 142
Sum of the 20 terms using: n/2(a + l) where l = last term.
= 20/2(9 + 142)
= 10 * 151
1510 hope ths helps