PLEASEEEEEE HELPPPPP!!!!

A radio active isotope decays according to the exponential decay equation where t is in days. For the half life: The half life i

worty [1.4K]

A radioactive material is an element that is highly unstable due to its high neutron-to-proton ratio. Because of this, they spontaneously undergo nuclear reaction under nuclear fission releasing subparticles. The time it took to consume half of the original amount of the radioactive material is called the half-life.

The equation is <span>a2=ae^(−9.753t), where a2 is the concentration after time t and a is the original concentration. The ratio of a2/a should be 0.5/1 or 1/2. Therefore,
a2/a = e^(-9.753t)
0.5 = e^(-9.753t)
ln(0.5) = lne^(-9.753t)
ln(0.5) = -9.753t
t = 0.071 days or 1.7 hours.

</span>

4 0

3 years ago

I need help I honestly don’t like this kind of math so it will be nice if someone will help

KonstantinChe [14]

Answer:

number two

Step-by-step explanation:

identity property of multiplication is the property of 1 so any thing multiplied be one is that number

4 0

3 years ago

Read 2 more answers

Lisa sliced 12 cakes. Each chocolate cake had 6 slices and each lemon cake had 5 slices. If Lisa made 70 slices in total, how ma

mamaluj [8]

Answer:

Slices of chocolate cakes = 60, Slices of lemon cakes = 10

Step-by-step explanation:

Given:

Total number of cakes, Lisa sliced = 12

Number of slices of each chocolate cake had = 6

Number of slices of each lemon cake had = 5

Total number of slices = 70

Question asked:

How many of each type of cake did she slice ?

Solution:

Let number of chocolate cakes = $x$

Then, number of lemon cakes = $12-x$

Now, given that, each chocolate cake had 6 slices:

By using unitary method:

1 chocolate cake had = 6 slices

$x$ chocolates cake had = $6x$

Similarly, each lemon cake had 5 slices:

1 lemon cake had = 5 slices

$12-x$ lemon cake had = $5(12-x)$

Now, as it is given that Lisa made 70 slices in total:

Total number of slices of 12 cakes = Total number of slices of chocolate cakes + Total number of slices of lemon cakes

$70=6x+5(12-x)\\ 70=6x+60-5x\\ 70=x+60$

By subtracting both sides by 60,

$x=10$

Total number of chocolate cakes = 10

Total number of lemon cakes = 12- 10 = 2

Total number of slices of chocolate cakes = number of chocolate cakes $\times$ number of slices of each chocolate cake

Total number of slices of chocolate cakes = $10\times6=60 \ slices$

Total number of slices of lemon cakes = number of lemon cakes $\times$ number of slices of each lemon cake

Total number of slices of lemon cakes = $2\times5=10\ slices$

Therefore, total number of slices of chocolate cakes and lemon cakes are 60 and 10.

3 0

3 years ago

Which of the following is not included in the interest calculation using adjusted balance method?

Ray Of Light [21]

Large payments
B. current purchases

5 0

4 years ago

Read 2 more answers

Let f(x) = x2 + 6 and g(x) = x + 8x g ( x ) = x + 8/ x . Find ( g o f)( -7)

nirvana33 [79]

Answer:

63/55

Step-by-step explanation:

Assuming $f(x) = x^2+6$ and $g(x) = x + {8}{x}$ . Find ( g o f)( -7) by substituting f into g. Then -7 into the new expression.

( g o f)( -7) =

$\frac{(x^2+6) +8}{x^2+6} \\\\ \frac{((-7)^2+6) + 8}{(-7)^2+6} \\\\ \frac{49+6+8}{49+6}\\\\ \frac{55 + 8}{55} \\\\\frac{63}{55}$

4 0

3 years ago