Find the measure of angle b.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?