Please help on volume of a cone! Will mark brainliest

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

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

If angle 2=3x +1 and angle 3=2x +4what is angle 2