Lin is running on a track Lin runs 8 laps around a track in 6 minutes. How many minutes per lap is that? How many laps per minute is that? (Round to the nearest hundredth) If Lin runs 18 laps at the same rate, how long does it take her?

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Ответ:

engbarthcobie

08.09.2022

Mathematics

37 days

Step-by-step explanation:

I assume the total we need is $687 million. I don't know what "two $687 million" means.

Day 1: 1 penny = 2^0 pennies = $0.00

Day 2: 2 pennies = 2^1 pennies = $0.02

Day 3: 4 pennies = 2^2 pennies = $0.04

Day 4: 8 pennies = 2^3 pennies = $0.08

Day x: $687,000,000 = 68,700,000,000 pennies = 2^(x - 1)

$2^{x - 1} = 68,700,000,000$

$\log (2^{x - 1}) = \log (68,700,000,000)$

$(x - 1) \log 2 = \log (68,700,000,000)$

$x \log 2 - \log 2 = \log (68,700,000,000)$

$x \log 2 = \log (68,700,000,000) + \log 2$

$x = \dfrac{\log (68,700,000,000) + \log 2}{\log 2}$

x = 37

37 days

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