Simplify the following expression: (5x2 + 3x + 4) − (2x2 − 6x + 3). if the final answer is written in the form ax2 + bx + c, what is the value of b?

Given the points a(-2, 1) and b(8, 6), find the coordinates of the point c on directed line segment ab, that partitions ab in the ration 2: 3.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Which of the following circles have their centers in the third quadrant? check all that apply.