Calculate the sum and enter it below. -21 + 12

Y=4x^2+x-1 solve using quadratic formula

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 graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)