A helicopter is flying at an altitude of 7,000 feet when it begins descending towards a landing 12 pad on top of a 500-foot building. The descent takes 10 minutes. The function A(t) represents the altitude of the helicopter, in feet, t minutes into its descent. Time What is the domain of A(t) ?
a. all real numbers SEC
b. all real numbers from 0 to 500
c. all real numbers from 0 to 10
d. all real numbers from 0 to 7,000