the 6th term of an ap is -10 and the 10th term is -26 determine the 15th term of the ap
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6th term =a+5d=-10
20th term=a+9d=-26
a+5d=-10-a+9d=-26
4d=-16
d=-16/4= -4
a+5d=-10
a+5×-4=-10
a+-20=-10
a-20=-10
a=-10+20
a=10
15th term =a+14d
10+(14×-20)
10+(-280)
10-280
=270
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