Answer:
20 mg
Step-by-step explanation:
The amount remaining is:
A = P (½)^(t / T)
where P is the original amount,
t is time,
and T is the half life.
A = 415 (½)^(22/5)
A ≈ 20
I believe it is <span>b)the square of the sum of 2 times x and 5</span>
IS calculation is not reasonable, first take all three totals and add them together. His total is $107.68, compared to his calculated $87.22 he is off by $20.64.