Tammy took medication to help her headache. The amount, a, in milligrams, of the medication left in her body after t hours is represented by the function a(t) = 200(0.63)^t. Select all true statements about the function.
a. Tammy initially took 126 mg of the medication.
b. Tammy initially took 200 mg of the medication.
c. The medication in Tammy's body is decreasing by 63 mg per hour.
d. The medication in Tammy's body is decreasing by 74 mg per hour.
e. The medication in Tammy's body is decreasing at a rate of 37% per hour.
f. The medication in Tammy's body is decreasing at a rate of 63% per hour.
