PLEASE ASAP Find the value of x

 this is in a fraction: X = 16/5, decimal form: x = 3.2, and in a mix number: x = 3 1/5

Step-by-step explanation:

The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try! A variable doesn't have to be "x", it could be "y", "w" or any letter, name or symbol.

Step-by-step explanation:

we know it's a perfect square so the first term has to be 4x and the second 3. let's check:

so the length of each side is

part b

that's the difference of two squares:

at this point we're supposed to say the rectangle's dimensions are

2x-7y by 2x+7y

but that's horse hockey. the rectangle dimensions are l, any positive number, and

but i'm almost certain they're expecting the wrong answer:

2x-7y by 2x+7y