What two numbers have a product of -30 and a sum of -1?

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?

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

Twelve less than a number is at most 20