Answer:


Step-by-step explanation:
We have the system of equations:

Let's solve by substituting. We know that
, so we can substitute
in as
in the equation
.

Simplify this down so that we have
on one side of the equation:

Now that we know the value of
, we can substitute it in to the equation
to find
.

Hope this helped!
You need to show us the circle in order to let us answer the question.
Let KLMN be a trapezoid (see added picture). From the point M put down the trapezoid height MP, then quadrilateral KLMP is square and KP=MP=10.
A triangle MPN is right and <span>isosceles, because
</span>m∠N=45^{0}, m∠P=90^{0}, so m∠M=180^{0}-45^{0}-90^{0}=45^{0}.Then PN=MP=10.
The ttapezoid side KN consists of two parts KP and PN, each of them is equal to 10, then KN=20 units.
Area of KLMN is egual to

sq. units.
Answer:
C) 21 ft x 36 ft
Step-by-step explanation:
Because 7 * 3 = 21 ft & 12 * 3 = 36 ft