5c + 3 - 2c + 5
5c - 2c + 3 + 5
3c + 8 ~~~
that is a rational number.
Answer:

Step-by-step explanation:
The figure shows a right triangle.
To calculate the measure of the angle A, you can use the inverse trigonometric function arctangent:

Identify the angle
, the opposite side and the adjacent side:

Substitute into
.
The measure of the angle A is:

Rounded to the nerarest hundreth:

The area would be 12.57
Hope that helps you! :)