At the beginning of a laboratory experiment, the temperature of a substance is -12.6 degrees celsius. during the experiment, the temperature of the substance decrease 7.5 degrees celsius. what is the final temperature of the substance?

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

Find two numbers if their sum is 91 and the ratio is 6: 7?

In the figure below, m∠r is 60°, and m∠t is 120°. what is m∠q? a. 60° b. 30° c. 120° d. 54