given a3=15,s10=125,find d and a10
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Answered by
1
Answer:
d= -1, A10= 26
Step-by-step explanation:
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Answered by
0
a
3
=15,s
10
=125
a
3
=a+(3−1)d
15=a+2d
a=15−2d
s
10
=
2
10
[2a+(10−1)d]
125=5[2a+9d]
25=2a+9d
25=2(15−2d)+9d
25=30−4d+9d
5d=−5
d=−1
a=15−2×(−1)
a=17
a
10
=a+(10−1)(−1)
a
10
=17−9
a
10
=26
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