The head of a pin has a diameter of 1 X 10^-4 meter. A bacterium has a diameter of 5 X 10-7 meter. How many bacteria that size would fit across the diameter of the pinhead?

Question and answers are in the attached picture. you so much in advance.

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

Solve the system of equations. y=3x-1 and y=-2x+9. show work