Find the half-life of radioactive substance Radium-226; A(t) = A0e-0.00043t

Initially, 10 grams of a radioactive substance were found in a sample. It was observed that 20% of the initial amount of radioactive substance disintegrated after 2 hours (that is, 8 grams remain after 2 hours). Find the half-life of the radioactive substance (that is, the time it takes for one- half of the initial amount to disintegrate) if the rate of disintegration of the radioactive substance is In z 1 2 0.7 proportional to the amount of the substance present at time t. You must begin your solution process by 3 considering the proportional relationship presented below. Use the natural logarithm table to the right 1.1 to provide an approximate answer. Your work must support your answer. 4 1.4 1.6 dA a A 6 1.8 dt 1.9 2.1 9 2.2 10 2.3 7,

Suppose a sample of 600 grams of a radioactive substance decays according to the formula  Q = 600· e−0.11t  where t is measured in years.Find the half-life of this substance. Round your answer to three decimal places.

Which of these values for P and a will cause the function f(x)=PaX to be an exponential growth function? Which of these values for P and a will cause the function to be an exponential growth function? p=1/7;a= 1/10 P=7;a=1/10 p=7;a=1 p= 1/7 ;a=10