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Ok so Anthony goes to the gym for 30min everyday he increases his time by half an hour

Wait did that even make sense what I just said

He increases his time by half an hour

does that make sense to you?

So your basically multiplying by 20

multiplying by 2

Oh yeah sorry that was dumb so that's all you do until you get the answer for day 5

Yes that's the part the I don't understand is how to set it up

The sum of the first n terms of a geometric series is
\[S_n=a_1\frac{ 1-r^n }{ 1-r }\]

a_1 = 30, r = 2 from above. And n = the number of days

Ok I will start solving to see what I get

Ok I got s=210/n I choose 3 for the number of days

yes, that's right.

Could you help me with 2 more questions if you can

Well good luck. You seem like you've got a solid understanding :).

Ok thank you

you're welcome.