Answer:
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