The 1st term of an arithmetic progression is a and the common difference is d, where d does not equal 0.
(i) Write down expressions, in terms of a and d, for the 5th term and the 15th term.
The 1st term, the 5th term and the 15th term of the arithmetic progression are the first three terms of a geometric progression.
(ii) Show that 3a=8d
I need help with (ii) please! I have the equations for (i) they are a + 4d ; a +14d

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have you done anything yet?

I actually don't even know where to start so no.

first, you have to figure what an arithmetic progression is

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