Posted by **Benjamin** on Sunday, February 3, 2013 at 9:16am.

Given that 1st term of an A.P is 7 and it's 10th term is twice the second term,calculate the (a) 19th term (b)sum of 28 terms (c) difference between 9th and 6th terms

- Math? -
**Writeacher**, Sunday, February 3, 2013 at 9:17am
Statistics??

What's the SUBJECT??

- Community technical college -
**bobpursley**, Sunday, February 3, 2013 at 10:58am
a10=a1+r(10-1)

14=7+r(9)

r=7/9

check

7, 7 7/9, 7 14/9, 7 21/9, 7 28/9, 7 35/9, 7 42/9, 7 49/9, 7 56/9, 14

Use the formulas for sum, knowing r, a1

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