21-10-2017
Mathematics

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Equation: y= -0.25x+1
After how many minutes is the timer 25% full?

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21-10-2017

Answer: 3 minutes

To solve this, I plugged 0.25 into the y value since it represents the amount of sand remaining. I then solved for the x value which gave me a value of 3. (I hope this helps)

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