The amount of the substance (At) at any time t is calculated through the equation,
At = (A0)(e^-kt)
where A0 is the initial amount and k is constant.
For the half-life,
ln (At / A0) = ln 0.5 = -k(5270 years)
The value of k is 1.3153x10^-4 / year.
Substituting this value to the same equation, where At = 0.25A0
ln 0.25 = -(1.3153 x 10^-4)(t)
The value of t from this equation is 10540 years. The closest value to this is letter A.
(2x + 7) + (2x) + (x + 18) = 180
5x + 25 = 180
5x = 155
x = 31 °
Y=7x-1 is that what youre looking for?
Answer:
Y
Step-by-step explanation:
