330 − 35d < 15 i need with this

Asphere has a diameter of 10 in. what is the volume of the sphere?

Which of the following is the result of expanding

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?