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OpenStudy (anonymous):
Which is the 25th term of the arithmetic sequence where a1 = 8 and a9 = 80 ?
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OpenStudy (anonymous):
224
OpenStudy (anonymous):
a = 8 a + 8d = 80 8 + 8d = 80 d = 9 a + 25d = 8 + 25(9) = 233
OpenStudy (anonymous):
@moneybird 25th term will be "a+24d" i think
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
25th term is 224
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OpenStudy (lilg132):
oops
OpenStudy (lilg132):
a + 24d = 8 + 24(9) = 8 + 216 = 224 is the 25th term
OpenStudy (anonymous):
medal medal
OpenStudy (anonymous):
224
OpenStudy (ash2326):
a9=a1+(9-1)D a1=FIRST TERM D=common difference 80=8+8*D D=9 a25=a1+(25-1)D a25=8+24*9 a25=224
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