I don't want to helo you cheat since it's a quiz, but just try to think literally. Look at the picture and you'll see which one makes sense. Ask each point and identify where they land.
Answer:
The expression that represents the number of days until only 10% remains is T((d) 10 %) =100×.
Step-by-step explanation:
The equation for half life is of the form
A = A₀×.........................................................................(1)
Where
A = Final amount
A₀ = Initial amount
t = Time
h = Half life
For the equation T(d) = 100×2⁽⁻²⁾....................................(2)
We have by comparison with the equation for half life
2 ≡ and and the equation (2) can be written as
Percentage remaining after 2 half lives is
×100=100×
However if the half life of Technetium-99m is 6 hours then we have for one day
×100=100×
Therefore an expression that represents the number of days until only 10% remains is
×100=100× = 10 %
=
= ㏑ = ㏑()
= ×㏑ = ㏑()
= = 3.322
Therefore the expression for the number of days 10 % of Technetium-99m will be remaining is
T((d) 10 %) =100×
Solve for c is what we must do.
A = b + cd
A - b = cd
(A - b)/d = c
Done.
Ten times ten equals one hundred, if that's what you are asking for.
We divide 55/8
Solution: 55/8 as a decimal is 6.875.