HELP HELP HELP HELP!!I WILL MARK BRAINLIEST IF CORRECT! Find the tangents of the acute angles in the right triangle. Write each answer as a fraction.

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?