<span>(5x-6)(5x+6)
= (5x)^2 - 6^2
= 25x^2 - 36</span>
X>5. i am 100% sure that this is your correct answer. hope this helps ya.
Can you please clarify what you want to ask? Thanks!
If the half-life is t, then every t days, the amount of the radioactive isotope will be cut in half.
(1/2)^(number of half-lives) = 3%
number of half-lives = ln(0.03) / ln(0.5)
This gives the number of half-lives as 5.06.
Then 300 days = (5.06)(length of 1 half-life)
length of 1 half-life = 300 / 5.06 = 59.29 days
