The fifth term of an arithmetic progression is 28 and the tenth term in 58.
The sum of all the terms in this progression is 444. How many terms are there?
In the previous question the answer shows that the first term is 4 and the common difference is 6. I also do have the answers available if needed.
Please help me! I don't know what to do to answer this. If you could just set me on the right track I could try to solve it myself.

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a_10 = 58 and a_5 =28 so subtract \[\huge\rm \frac{ 58-28 }{ 10-5 }\]

Ok, so you get the common difference of 6.

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