Write an equivalent expression by distributing the "−" sign outside the parentheses:
-(-6f+6.1)

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation:

the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!

add 8+12 to get a simplified answer of 12r-20

this is a tricky question, lol,   but i think the answer is 100,000.