Question

Can somebody help me with 3 and 5 pleaseeee!

Answer 1

3.
There can (and have to) be two values which bring in a monthly revenue of $1200. This is because of the very nature of quadratics in that every one has 2 answers (unless it has complex roots). So, if you actually factor the quadratic, and plug in $1200 for the y-value, you'll get 2 x-values.

5.
Since it's a right triangle, you can set it up as follows:

`x^2+(x+10)^2 = 75^2`

Now, we'll just solve for x, which is the distance of Train 1. To do that, just simplify the equation first:

`x^2 = 75^2-(x+10)^2`

I can square root both sides to get:

`x = √(-(x+85)+(x-65))`

So, that's how far the first train traveled, and the second train just traveled:

`x = √(-(x+85)+(x-65))+10`