Question

explain double answer​

Answer 1

Answer:

Using the formula for sum of n terms of an Arithmetic Progression, I get (Your equation is wrong, probably due to typos; refer to mine, and figure out where you made mistakes)...5310=n(2(177)−3(n−1))2

[Double answer is due to a quadratic equation arising.]

Solving for n yields n = 59 or n = 60 => 89 or 90 minutes.

Now realise, that he counts 3 dollars IN THE 89th minute. He counts zero dollars in the 90th minute, because by the end of the 89th minute, he has finished counting. (Because the 89th term of the sequence is 3, a.k.a, when rephrasing the answer to the question, in the 89th minute, he counts the last 3 dollars).

Therefore it is, in fact, 89 minutes.

Answer 2

Answer:

explain double answer ...