! A box contains a radioactive substance. The number of kilograms, r(t), at time t years
is given by r(t) = 2-0.002588t. How many kilograms will be remaining after 160 years?
1) about half of the original amount
2) about one-fourth of the original amount
7
3) about one-eighth of the original amount
4) about three-fourths of the original amounT

answer: c

because if you look at the chart you can see a pattern and compare it to the question he simplify out your

but i think the formula is f(x)=6x

to have more of what you want like money

step-by-step explanation:

save it by not spending on unnecessary stuff and have more

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72