Answer?!?!? I don’t know this so I need help

B.

Step-by-step explanation:

The number of days is 1.2 as it is the variable and is multiplied by a number d, so the giraffe grows 1.2 inches a day.

According to a website, it says, 
"Let L represent the length and W represent the width.
.
You are told that L equals 2 inches more than 2W. In equation form this is:
.
L = 2W + 2
.
Next you are told that the perimeter (P) is 34 inches. The perimeter is found by adding all
the sides. In other words:
.
P = L + W + L + W
.
By combining like terms on the right side this can be simplified to:
.
P = 2L + 2W
.
Substitute 34 for the perimeter to get:
.
34 = 2L + 2W
.
But since L = 2W + 2 we can substitute 2W + 2 for L in the perimeter equation to get:
.
34 = 2(2W + 2) + 2W
.
Multiply out the right side by finding the product of 2 and each of the terms inside
the parentheses. When you do, the equation becomes:

.
34 = 4W + 4 + 2W
.
Get rid of the 4 on the right side by subtracting 4 from both sides to get:
.
30 = 4W + 2W
.
Combine terms on the right side to reduce the equation to:
.
30 = 6W
.
Solve for W by dividing both sides by 6 to get:
.
5 = W
.
So we know the width is 5 inches. But our first equation tells us that the Length is
twice the width plus 2 inches ... or 2 times 5 and then add 2. This makes the length 12
inches.
.
In summary, the width is 5 inches and the length is 12 inches.
.
Check by adding the 4 sides: 5 + 12 + 5 + 12 to get 34 inches for the perimeter, just as 
it should be.
.
Hope this helps you to understand the problem and how to solve."