SOLUTION: 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 da

Algebra ->  Probability-and-statistics -> SOLUTION: 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 da      Log On


   

Question 1161332: 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
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
looks like an arithmetic sequence.
with an arithmetic sequence, An = A1 + (n-1) * d
Sn = n * (A1 + An) / 2
in your problem, A1 = 10 and d = 4 and n = 7
A7 = 10 + 6 * 4 = 34
S7 = 7 * (10 + 34) / 2 = 7 * 44 / 2 = 7 * 22 = 154.
looks like you're good to go.