math

posted by Carly

The number of days, d, it takes for a construction crew to repave a certain road varies inversely as the number of workers, w, that work on the project.

So my equation is d = k/w

If w = 16, how do I find d?

d = k/16

Also, why is Y = 2x^2 + 3√x not a quadratic equation? It's highest power of x is 2.

Thank you.

1. Z

Yes.

And it's because square root of X can be a negative number which would make it an imaginary number.

2. Carly

Z, thanks, however, in my first question, how do I find d in that equation?

3. Reiny

Y = 2x^2 + 3?x is NOT a function, since a quadratic must have the form
y = ax^2 + bx + c
that is, the exponents of the x term can only be 2 or 1
the term ?x is x^(1/2)

Furthermore, the graph of a quadratic function is a parabola, the graph of Y = 2x^2 + 3?x
looks like this, not a parabola

http://www.wolframalpha.com/input/?i=plot+Y+%3D+2x%5E2+%2B+3%E2%88%9Ax

as to your first question, you need extra information to find k, and after that you can find d

4. Z

Is the number of worker the only variables they give you?

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