15.90 times 3 equals your answer 47.70 hope I helped
Answer:
the unit rate is 11/1.
Step-by-step explanation:
121/11 = 11/1
we divided the original denominator by itself to get 1, aka the unit rate. 11 divided by 11 is 1. What we do to one we have to do to the other, and 121 divided by 11 is 11. Therefore the unit rate is 11/1
It is porportional because it stays the same, 200 feet per minute
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×