There was a substance of a 450 milligrams of radioactive substance to start a study. since then the sample has decayed of 5.4% each year. let t be the number of years since the start of the study. let y be the mass of the sample in milligrams. write an exponential function showing the relationship of the y and t

Step-by-step explanation:

The general formula for decay is:

 ; where:

Given:

Equation:

(- 1, 0 )

step-by-step explanation:

an x- intercept is where the function crosses the x- axis.

to find the x- intercept/s look for the value of x when f(x) = 0

from the given table there are 3 values of x where f(x) = 0

when x = - 1, x = 2, x = 3

the one that is listed is (- 1, 0 )