Question

given a15= 2a,d=2, find a and s15.
plz answer this fast​

Answer 1

Answer:

a 3 =15,s10 =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

Answer 2

Answer:

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