Answer:
x=13
Step-by-step explanation:
Simplifying
8 + 2x = 34
Solving
8 + 2x = 34
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-8' to each side of the equation.
8 + -8 + 2x = 34 + -8
Combine like terms: 8 + -8 = 0
0 + 2x = 34 + -8
2x = 34 + -8
Combine like terms: 34 + -8 = 26
2x = 26
Divide each side by '2'.
x = 13
Simplifying
x = 13
Answer:
1=B
Step-by-step explanation:
C. 75 im pretty sure all i know is that is one of the postitive ones it might be D
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×