Plz help...I'll be ur fan................ Blake goes running for 10 minutes on Sunday. Every day he doubles his running time. If he continues this pattern, how many minutes will he run on the 7th day? I'm confused about which formula I should use: f(n) = f(1) • r^(n−1) or an = a1 • r^(n−1) are these even the correct formulas for this question????

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Plz help...I'll be ur fan................ Blake goes running for 10 minutes on Sunday. Every day he doubles his running time. If he continues this pattern, how many minutes will he run on the 7th day? I'm confused about which formula I should use: f(n) = f(1) • r^(n−1) or an = a1 • r^(n−1) are these even the correct formulas for this question????

Mathematics
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yes those are the correct ones and both say the same thing if you use the second one, a1=10, r=2 and n=7
So that means that on the 7 day he would run 640 minutes???? @rajat97

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Other answers:

i'm calculating!
yes you are right
what do you mean by doubling
no that's not right @princeharryyy has got it
day 1 =10 =10 day2 = 2*10 =20 day3 = 2*2*10 =40 ..... day7 = (2^6 )* 10 = 64*10 =640minutes @rajat97 and @plzzhelpme
and that was right @rajat97
wait........it was right..
oh yeah! silly me!
yeah! silly you! that was right.
ok thanks alot... what formula would u use for this question?? Alex studies for an exam for 50 minutes on Monday. Every day he increases his study time for 5 minutes. If he continues this pattern, how many minutes will he study on the 7th day?
this is an arithematic progression
you can use a1 + (n-1)d
here d=5, n=7and a1=50
50, 50+5, 50+5+5, 50+5+5+5, ..... and so on
and that would be 80 minutes on day 7 right?
yup
ok....thanks alot:* :* :*
* :* :*

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