The sum of 21 and five times a number f is 61?

The correct answer is letter c.

Step-by-step explanation:

The area equation of a triangle is given by:

 (1)

Where:

b is the base

h is the height

Let's find first the angle MJK (α), using the tangent definition.

Now, if α = 37° then β (angle JLK) must be:

Now, we can find the distance ML using again the tangent definition:

The base of the triangle LKJ will be:

Therefore, using equation (1) the area of △LKJ will be:

The correct answer is c.

I hope it helps you!