60+42.95x=25+49.95x value for x

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?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

With number 11 ( show how you got the answer)