Question 1161339

Is it B? I want to check my answer.

James decided to start exercising. The first day he jogged for 10 mins. The next day he wanted to jog for 4 more minutes than the previous day. He wanted to continue increasing by the same amount like this for every one of the days in a week.

If he succeeded in doing this how many total minutes did he run for the week?


A. 34 minutes

B. 154 minutes

C. 14 minutes

D. 90 minutes



The question is provided in the link here: https://i.imgur.com/AdSC8Bk.png
<pre>You're CORRECT, but I do hope you didn't calculate it the way that woman did. That method is extremely inefficient, and very time-consuming. 
Somehow I just "feel" that you know that!

Sum of an A.P: {{{matrix(1,3, S[n], "=", (n/2)(2[a1] + (n - 1)d))}}}
{{{highlight_green(matrix(4,3, S[7], "=", (7/2)(2(10) + (7 - 1)4), S[7], "=", (7/2)(20 + 24), S[7], "=", (7/2)(44), S[7], "=", highlight(154)))}}}