Question about The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac

# 1.15x² -26x + 8

Yes

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What's the question?
If you're asking for the derivative, it's 1.15x - 26

Posted on Dec 08, 2014

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Posted on Jan 02, 2017

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Start with the statement of the problem: 9 is 15% of x, or 9/x = 15/100.

Multiply both sides by 100x:

9/x * 100x = 900 for the left side and 15/100 * 100x = 15x for the right side. This gives: 900 = 15x.

Divide both sides by 15:

900 / 15 = 60 for the left side and 15x / 15 = x for the right side. This gives: 60 = x. Hence the answer is 60.

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To calculate that, this is what you do:

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Let us call the initial amount, x.

Then our parameters are:
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cross multiplying
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This expression 5x^2+15x+3 is not an equation, therefore it can have any value depending on the value of x. You have to make it an equation before looking for the particular value of x that satisfy your equation 5x^2+15x+3 =0

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