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Amanda [17]
3 years ago
6

Find the 21st term of the arithmetic sequence: 18,23,28,33,...

Mathematics
1 answer:
Andreyy893 years ago
5 0
18,23,28,33,... \\ 
a_1=18 \\
d=5 \\ \\
a_n=a_1+d(n-1) \\
a_{21}=a_1+20d \\
a_{21}=18+20 \times 5 \\
a_{21}=18+100 \\
\boxed{a_{21}=118}
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