All of my answers are wrong, and i have no idea what i am doing wrong An isotope

Question

All of my answers are wrong, and i have no idea what i am doing wrong

An isotope of a radioactive element has decay constant equal to 0.1 per year.

Initially, there are 30 million atoms of the isotope present.

Since the isotope decays exponentially, the number of atoms obeys the following equation

In this question, time is measured in years and the number of atoms, P, is measured in millions.

Decay constant : per year.

(Enter your answer correct to two decimal places.)

Half-life : years.

(Enter your answer correct to one decimal place.)

Number present after 8 years : million.

Explanation / Answer

Exponential Growth/Decay Formula: P = P?e^rt

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