Which number is closest to 49? 48.4, 48 1/2, 48.09, 48 3/5

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

52 cm radius = diameter = area = circumference = circumfer

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?