The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 6.4% per day. Find the half-life of this substance (that is, the time it takes for one-half the original amount in a given sample of this substance to decay).

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.

x+14

step-by-step explanation:

you can't solve x because it is 2 linear equation and you only have one equation