A0.3 ml dose of a drug is injected into a patient steadily for 0.65 seconds. at the end of this time, the quantity, , of the drug in the body starts to decay exponentially at a continuous rate of 0.35 percent per second. using formulas, express as a continuous function of time, , in seconds.

Use the compound interest formula: A=P(1+i)^t.

P is the initial amount of the drug, 0.3ml.
i is - 0.0035.
t is in seconds.

You'll get:
A=0.3(1-0.0035)^t.

Sub in any value on t to find out how many ml are left t seconds after injection.

The 0.65 second injection time does not seem to be relevant as the question clearly states that the exponential decay starts AFTER the injection is completed.

5días gucgivuzu 32 horas y horas 6y t7