Problema Solution
Before a series of x-rays are taken, a patient is injected with a special contrast mixture that highlights obstructions in his blood vessels. The amount of the original dose of contrast material remaining in the patient's bloodstream h hours after it is injected is given by h-3/2. How much of the contrast material remains in the patient's bloodstream 9 hours after the injection?
Answer provided by our tutors
The amount of the original dose of contrast material remaining in the patient's bloodstream = h = -3/2
after injection increased by 9 hours
so , the contrast material remains in the patient's bloodstream 9 hours after the injection
= 9 + (-3/2)
= 9-3/2
= (18 -3)/2
=15/2
=7.5 houre