A sample of a radioactive isotope had an initial mass of 860 mg in the year 2010 and decays exponentially over time. A measurement in the year 2013 found that the sample's mass had decayed to 570 mg. What would be the expected mass of the sample in the year 2022, to the nearest whole number?

hahahab what do you mean

y=166

Step-by-step explanation:

the second option

step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0