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22-01-2020
Mathematics

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The 9th term of an arithmetic progression is 8 and the 4th term is 18.
Find the 1st term and the common difference, d.

Respuesta :

jimohfawwazajibola25 jimohfawwazajibola25

22-01-2020

Answer:

a = 24 and d = -2

Step-by-step explanation:

The 9th term = a + 8d

the 4th term = a + 3d

from the question it is given that

a + 8d = 8----------(1)

a + 3d = 18---------(2)

Solve the two equations simultaneously we will be a = 24 and d = -2

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