math

in an ap the difference is between the 8th and 4th term is 20 and the 8th term is one and the half times the fourth term what is the common difference

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1. since T8 = T4+4d, d=5

and, just for completeness,

a+7d = 3/2 (a+3d)
a+35 = 3/2 (a+15)
2a+70 = 3a+45
a=25

So, the sequence is

25 30 35 40 45 50 55 60 ...

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2. This not what I asked for

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3. In an AP the difference between the 8th and 4th terms is 20and the 8th is one and half x the 4th term
(i) Find the common difference
(ii) Find the first term

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4. a+7d=3/2

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5. I will fail my assignment

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