senecahawthorn
senecahawthorn senecahawthorn
  • 25-11-2018
  • Mathematics
contestada

Find that 10th term of each arithmetic sequence
1). A4=12 and A7=20.4

2.) A3=37 and A17=-12

3.) A13=-5 and A18=-51

4.) A25=18 and A41=62


Respuesta :

Аноним Аноним
  • 25-11-2018

1.

 4th term  = a1 + 3d = 12  (where a1 = first term and d = common difference.)

7th term = a1 + 6d = 20.4

subtract  4th from 7th term, we get:-

3d = 8.4

d =  2.8

So 10th term = 7th term + 3(common difference)

= 20.4 + 3(2.8)

= 20.4 + 8.4

= 28.8    (answer)

All the  rest can be answered in  the same way.

Answer Link

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