Ali is planning to keep fit through practicing push-ups for 21 days. on the first day, he can only do 14 push-ups in a minute. He plans to do x more push-ups in a minute on the next day.

Question

How many push-ups can he do in a minute on 11th days? (in term of x)

Answer 1

This looks just like a good-ol' fashioned arithmetic sequence with
a = 14 and d = x

use your formula for term(11)

Answer 2

It is the answer is 14 + 10x ?

Answer 3

correct

I hope x is small, to be realistic...