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I don't understand his solution.

The problem is I don't understand his solution.

(C) Parabola

Now, You Got It !!!!.

See detailed answer here:  https://web2.0calc.com/questions/help_73560

See answer here:  https://web2.0calc.com/questions/help_73560

Since the board is a square the total area of the shape is 12*12 = 144. we know that the side length of the rectangle that was taken out was 10 because 2 feet of the board still remain. we know the height of the board taken out is 4, by looking at the picture, so the boards area is 144 - 40 = 104

12*12 - 10*4 = 144 - 40 = 104ft²

Aha, so I have totally impossible expectations.

2x+5°+ 65° = 180°

    2x + 70° = 180°

              2x =110°

                x = 55°

MathKing, you are not only doomed to disappointment, you are just doomed. 

Not all is lost:  If you and Mr. BB have one of your “intellectual” conversations, then maybe Ginger will write some more hilarious satire.

The graph of the function c(x) goes through the points (2,22.5) and (5,607.5). If this function can be written in the form c(x)=a(b)^x, what is the value of a in the equation?

To the person answering this, can I get an explanation for each step, because I want to learn how to solve this problem and future problems that are like this one. Thanks!

Of course! I´d look into it...

Did you understand what Alan said about "Fermat Last Theorem" ?? Look it up and read about it !!.

While this does get you there eventually, it's much longer and harder than is really necessary. You could also use matrices, but it also is much more time-consuming and more complex than is really necessary. If you have a feel for about how high you can get with those kinds of numbers, you can easily poke around that area until you find the peak and get the answer much quicker. 

I'm sorry, your photo didn't attach. Maybe try again?

The equation h = -16t^2 + 40t models the altitude a football will reach t seconds after it is kicked.

Hello, Friend!

For this equation, the easiest way to do it is to plug in different times. Let's start!

First off, it'll probably take a second for the football to get near it's peak, so let's start with t=1.

Ok, not quite 25. Let's try t=1.25!

Great! We found the answer to A - the ball reaches 25 feet after 1.25 seconds. But does it keep rising enough to hit 30 feet, or will it plateau too soon? Let's try t=1.5.

As it turns out, the ball has reached it's plateau and rises no higher! In the end, we find that the answer is yes, just barely, for A but a resounding no for B. 
 

I hope this helped you get a firmer understanding of this kind of equation! Physics seems hard now, but you'll look back soon enough and say, "That was actually kinda fun!" Good luck on your journey, my friend!