Mathematics, 02.10.2019 17:30 20009
If the fifth term of a ap is 19 and the tenth term is 34 find: - a) the first term b) the common difference c) the sum of the first 15 term
Answers: 1
...(1)
...(2)
![S_n=\frac{n}{2}[2a+(n-1)d]](/tpl/images/0283/5650/b603c.png)
![S_{15}=\frac{15}{2}[2(7)+(15-1)3]](/tpl/images/0283/5650/5af0a.png)
![S_{15}=\frac{15}{2}[14+(14)3]](/tpl/images/0283/5650/d709c.png)
![S_{15}=\frac{15}{2}[14+42]](/tpl/images/0283/5650/06ad4.png)
![S_{15}=\frac{15}{2}[56]](/tpl/images/0283/5650/70391.png)
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If the fifth term of a ap is 19 and the tenth term is 34 find: - a) the first term b) the common dif...
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