Question

the number of bacteria in a sample can be modeled by the equation yy=75(.8)^xx where y is the number of bacteria and is x the number of days elapsed. what is the rate of decay?

Answer 1

20 % decay

Explanation:

Exponential equations are in the form

y = a * b^x

a is the initial value

b is the growth or decay

b>1 is growth b-1 rate of growth

b <1 decay 1-b rate of decay

1-.8 = .2

Change to decimal form

20 % decay