Answer:
$3.5
Step-by-step explanation:
21/6=3.5
Given that we know the initial mass of Iodine and its half-life, we want to see how much will remain after 40 days.
After 40 days, 244.17 grams of Iodine will remain.
<h3 /><h3>The half-life of materials and how to use it:</h3>
The half-life of a material is the time it takes for that amount of material to reduce to its half.
We can model the amount of Iodine as:
A(t) = A*e^{k*t}
- Where A is the initial amount, in this case, 7800g.
- k is a constant that depends on the half-life.
- t is the time in days.
Replacing what we know, we get:
A(t) = 7800g*e^{k*t}
Now we use the fact that the half-life is 8 days, this means that:
e^{k*8} = 1/2
ln(e^{k*8}) = ln(1/2)
k*8 = ln(1/2)
k = ln(1/2)/8 = -0.0866
Then the function is:
A(t) = 7800g*e^{-0.0866*t}
So now we just need to evaluate this in t = 40.
A(40) = 7800g*e^{-0.0866*40} = 244.17g
So, after 40 days, 244.17 grams of Iodine will remain.
If you want to learn more about half-life and decays, you can read:
brainly.com/question/11152793
Answer:
Se almacena un cuaderno por caja, significando 120 cuadernos en 120 cajas iguales.
Step-by-step explanation:
A partir del enunciado, podemos calcular el número de cuadernos por caja al dividir el total de cuadernos en la carretilla por el número de cajas disponibles.
Se almacena un cuaderno por caja, significando 120 cuadernos en 120 cajas iguales.
Answer:
3x+2x=5x but 4 can't add to 3x and 2x
That depends on where you live. The purpose of writing down your
weight is often to tell other people what your weight is, so you want to
record it in units that the other people around you understand.
If you live in rural Scotland or Ireland, then you'd want to record it
in terms of stones and pounds.
If you live in Liberia, Myanmar, or the USA, then you'd probably
weigh yourself and record the results in pounds.
Anywhere in the rest of the world, it would be recorded in terms of kilograms.
You must be especially careful in the USA. Here, you must not allow
any metric units to appear anywhere in your records, for if the eye of
an American should chance to fall on any written mention of a liter,
a meter, or a kilogram, the effect on his American physiognomy is
toxic. His blood evaporates, his eyes turn backwards in their sockets,
and his abdomen falls out onto the floor. Worst of all is the effect on
his brain. It is well established now that having been born in the USA,
or after living there for some period of time, a person is incapable of
comprehending the metric system of units, so the rest of us must
protect them from it.
