Answer:
The principal function of platelets is to prevent bleeding. Red blood cells are the most numerous blood cell, about 5,000,000 per microliter. Red blood cells make up about 40% of our total blood volume, a measure called the hematocrit
If you factor it then your answer will be -3(-3z-5) if you simplify the answer is 9z+15
The answer is B maybe try it?