1. find measure of A 2. find measure of B
3. find measure of C
4. find measure of D

solve and give explanations and pictures pls

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?

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?