B - c - 5 is an expression or equation

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Which of the following tables represents exponential functions?

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?