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Answers by Kerrie T.

how do you solve a trinomial equation? (answer)

Just in case you don't get the "binomials equal to 0 part"  this fact that you can use the two factors to solve for x comes from the "zero property of multiplication". If two numbers (known as factors) give a product of zero when multiplied together, then the only way...

How do you write a piecewise function from a word problem (answer)

You are right, you need a piecewise function, which you can separate based on the the segments of the domain that are given in words... First, there is the the segment from 0-400 kwh, then the segment from 400 - infinity (what an electric bill!)   Here is how to write...

is there a easier way to learnt Quadratic Equations? (answer)

I think you should play angry birds! No really, we do it in math class all the time.  A quadratic equation describes a parabola, which just happens to be the shape of the curve made by the bird as it is sling-shotted through the air.  Well, really it is an inverted parabola, and I will...

how can you make math seem fun when you are trying to each someone? (answer)

If your friend likes art, you can use that to motivate discussions about math.  For instance symmetry is a concept that has a lot of art application, as do triangles, squares, etc.  It all depends on what subject she is studying.  You can find interesting lesson plans and tools...

Physics' Quesion (answer)

You must draw a force diagram on the box.  The weight acts down and is perpendicular to the movement.  It doesn't do any "work" The Floor acts horizontally, opposing motion Normally, I would consider the friction to be proportional to the Normal force and do some...

5x+2y=43x+4y+2z=67x+3y+4z=29 (answer)

I think you start with setting each of the equations equal to 29: 5x+2y=29 solve this one for y (in terms of x) 43x+4y+2z=29 67x+3y+4z=29 combine these two so that you eliminate z y= (29-5x)/2 and (86 - 67)x +(8-3)y = 19x+5y = 29. Now you could use these two equations to...