Prove that in each triangle the total angles are 180 degrees

This is a proof that the angles in a triangle equal 180°:

The top line (that touches the top of the triangle) is
running parallel to the base of the triangle.

So:

And you can easily see that A + C + B does a complete rotation from one side of the straight line to the other, or 180°

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.

18.75 gallons

step-by-step explanation: