If sec = -12/13
what is the value of cos 0?

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

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?