Can someone help me please!!

Yes I can. So I will.

Step-by-step explanation:

Anytime you found yourself in doubt and danger about equations, you can use Geogebra Graph Calc - search for it -, and he will show you the graphic.

But, as I know that you are one the LAST HEROES IN EARTH, I pretty sure you don't want to just surrender yourself for a computer machine.

Let's calculate it:

4x² - 39x + 77

Bháskara Formula, you probably know her as Resolutive Formula, as she is known in my country, is:

there is also two signals + - betwen -b and the root.

She's one of the best ways to find roots for quadratic equations.

We will need to do that to find the interval required.

Also, remember that a generic quadratic equation can be describe as:

ax² + bx + c

So, knowing that in this equation

a = 4 / b = -39 / c = 77

We can proceed.

x' = - (-39) + / 2.4

x' = 39 + 17/ 8

x' = 7

x'' = 39 -17/8

x'' = 2,75

Now, you should know that when A > 0 the quadratic equation has her concavity facing down.

As we have the values of the roots, 7 and 2,75, we know that betwen them the equation has negative values.

That also means that all values higher than 7 and lower than 2,75 give to us a positive value.

Final

x<2,75 and x>7

You will see in annex the graphic.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.

the answer is 54 sq. ft. i just did this question, on odyssey ware, and it was right. make brainliest.