Answer:
The correct answer is A.
Step-by-step explanation:
The area of a rectangle can be calculated using the following formula:

If we know that the area measures
and one side of the figure measures 4.2 m, we can say that:

We isolate the side we don't know:

So I = 9 m
To know the perimter of a rectangle, we use the following formula:



$30 because 12/6 = 2 so 15 x 2 = 30
A^2-3a+14 is the answer :)
Answer:

Step-by-step explanation:

<span>a. A two-dimensional figure</span>