Problem Combine the like terms to create an equivalent expression:

y−(−3y)
please someone explain to me how to do this?

Adriveway is 40 yards long about how many meters long is it

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?

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?