Question

Whats the 20th term of 25,40,55,70,85 ?

Answer 1

310

Explanation:

the equation would be:

10+15n, where n is the term number.

the 1st term (n=1) would be

= 10+15(1) = 25, which is correct

the 2nd term (n=2) would be:

= 10+15(2) = 10+30 = 40, which is correct

The 3rd term (n=3) would be:

= 10+ 15(3) = 10+45 = 55, which is correct

So the 20th term (n=20) would be:

= 10+15(20) = 10 + 300 = 310