what is the sum of the 1st 10 terms of the arithmetic series that has a 10th term of 50 and a 1st term of 5

Answer 1

a = 5
term(10) = a+9d
5+9d = 50
9d = 45
d = 5

so you have a=5 and d=5

can you take it from there?

Answer 2

325