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x=12

Step-by-step explanation:

To solve for the variable, we must isolate the variable, which is x.

3 is being subtracted from the square root of x+4. The inverse of subtraction is addition. Add 3 to both sides of the equation.

The square root of x+4 is being taken. The inverse of a square root is a square. Square both sides of the equation.

Evaluate the exponent.

4^2= 4*4=16

4 is being added to x. The inverse of addition is subtraction. Subtract 4 from both sides of the equation.

The solution to this equation is x=12.

the correct answer is the second option

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.