The decay of 277 mg of an isotope is described by the function
A(t)= 277e-0.019t,
where t is time in years.
To find the amount left after 64 years,
We substitute t = 64 in the expression.
A(t=64)= 277e-0.019(64)
or A(t=64) = 277 * e-1.216
= 277 * 0.29
= 82 mg
<span>-1901075.28726
</span>I do not know if this is correct or not but I hope this helps!
Answer:
The radius is 25 cm
A
Step-by-step explanation:
Area =
* r^2
Area = 625 *
625 = * r^2 The s cancel out
r^2 = 625 Take the square roots of both sides
sqrt(r^2) = sqrt(625)
r = 25
