Need help ASAP!!!! Been thinking for a long time.

The mass of the substance left after 12 days is 501.51g.

Data;

This is defined as the time taken for the radioactive sample to decay to half it's initial size.

This is given as

[tex]T_\frac{1}{2} = \frac{\ln 2}{\lambda}[/tex]

where

Let's substitute the values and find the disintegration constant

[tex]T_\frac{1}{2} = \frac{\ln 2}{\lambda} \\4 = \frac{0.693}{\lambda} \\\\\lambda = \frac{0.693}{4}\\ \lambda = 0.17325[/tex]

But the value of a radioactive substance present at a given time is

[tex]N_t = N_o e^-^\lambda ^t[/tex]

Let's substitute the values and solve.

[tex]N_t = 7600 e^-^0^.^1^7^3^2^*^1^2\\N_t = 7600 * 0.065988\\N_t = 501.509g[/tex]

The mass of the substance left after 12 days is 501.51g.

Learn more on radioactivity here;

https://brainly.com/question/2320811

Answer:

nothing wbuuuu

Step-by-step explanation:

Answer:

Hey

Step-by-step explanation:

How are you doing???

Answer:

52 ft squared

Step-by-step explanation:

1. Draw the picture with measurements

2. Decompose each shape

3. Find the area of each (l*w)

4. Add each measurement up

Answer: No solutions

Step-by-step explanation:

|x|+5<1

Subtract 5 from both sides.

|x| < -4

No solutions is possible

Answer:

y = -2x + 3

Step-by-step explanation:

Lines that are parallel have equal slopes but lines that are perpendicular have slopes that are opposite reciprocals.  The slope of the given line is [tex]\frac{1}{2}[/tex] so the slope of all perpendicular lines will be - 2.  The new line must pass through the point A(2, -1).  Using the formula y = mx + b and replacing y with -1 and m with -2 and x with 2 gives -1 = -2(2) + b.  This will simplify to -1 = -4 + b.  Adding 4 to both sides gives 3 = b so the equation is y = -2x+3.

Answer:

1. 90 degrees because of supplementary angles

2. 180 degrees

3. 90 degrees

4. 37 degrees, since the sum of the interior angles add to 180, 180-90-53 = 37.

5. 127 degrees, supplementary angles 180-53

6 . 23 degrees, use the triangle sum theorem 180-30-127

Answer:

19. 13

20. 6

21. 12

Step-by-step explanation:

Answer: 20 (Option C)

Step-by-step explanation: Since B is the midpoint, Just set 5x and 3x+4 congruent to eachother. After you find out x ( which is 2) just plug it in and add them to get AC.

Answer:

Lucas will walk [tex]1\frac{3}{4}[/tex] miles if he takes route B

Step-by-step explanation:

Length of route A = [tex]2 \frac{1}{8} miles[/tex]

Length of route A [tex]=\frac{17}{8} miles[/tex]

We are given that route A is 3/8 mile longer than route B

Let b be the length of route B

So, [tex]b+\frac{3}{8} =2 \frac{1}{8} \\b+\frac{3}{8} =\frac{17}{8}\\b=\frac{17}{8}-\frac{3}{8}\\b=\frac{14}{8}\\b=\frac{7}{4}\\b=1\frac{3}{4}[/tex]

Hence Lucas will walk [tex]1\frac{3}{4}[/tex] miles if he takes route B

Answer:

[tex]x^2-10x+2[/tex]

Step-by-step explanation:

Given the following question:

[tex](3x^2-11x-4)-(x-2)(2x+3)[/tex]

To find the answer we need to simplify by using inverse operations and of course grouping like terms.

[tex](3x^2-11x-4)-(x-2)(2x+3)[/tex]
[tex]3x^2-11x-4-\left(x-2\right)\left(2x+3\right)[/tex]
[tex]\left(x-2\right)\left(2x+3\right)=-2x^2+x+6[/tex]
[tex]3x^2-11x-4-2x^2+x+6[/tex]
[tex]3x^2-2x^2-11x+x-4+6[/tex]
[tex]-4+6=2[/tex]
[tex]3x^2-2x^2-11x+x+2[/tex]
[tex]3x^2-2x^2=x^2[/tex]
[tex]x^2-11x+x+2[/tex]
[tex]11x-x=10x[/tex]
[tex]x^2-10x+2[/tex]

Your answer is "x^2 - 10x + 2."

Hope this helps.

E the anwser is c

Step-by-step explanation:Finding Slope from a Table Worksheet Step-by-Step Example. 1 Find the change in the y-values by subtracting from one row to the next. 2 Find the change in the x-values by subtracting from one row to the next. 3 Divide the difference in the y-values by the difference in the x-values.

Answer:

oh hun is 640kg stupid cow

Step-by-step explanation:

[tex]\cfrac{9}{x}~~ = ~~\cfrac{x}{18}\implies 162=x^2\implies \sqrt{162}=x\implies \sqrt{9^2\cdot 2}=x\implies 9\sqrt{2}=x[/tex]

Answer:

3 boxes.

Step-by-step explanation:

Solution,

Given,

The number of cookies : 7 × 5 = 35

Now,

The total number of cookies to cookies per box 35 ÷ 12 = 2.9 box

= 3 boxes.

Answer:

c. zero product rule

Step-by-step explanation:

apex

Answer:

Well if you are trying to say if they are the same then no

Step-by-step explanation:

-33≠-13

Hope this helps!

The height of each individual cracker is one-eighth inch. Then the correct option is B.

It deals with the size of geometry, region, and density of the different forms both 2D and 3D.

A type of cracker, rectangular in shape, is stored in a vertical column with all of the crackers stacked directly on top of each other.

Each cracker measures 2 inches in length by one and one-half inches in width.

The volume of the column is 15 inches cubed.
If there are 40 crackers in the column

The height of the cracker will be

[tex]\rm h = \dfrac{15}{1.5*2}\\\\h = 5[/tex]

The height of each individual cracker will be

[tex]\rm h_c = \dfrac{5}{40}\\\\\\h_c = \dfrac{1}{8}[/tex]

More about the geometry link is given below.

https://brainly.com/question/7558603

Answer:

Step-by-step explanation:

is the answer

Answer:

Rational.

Step-by-step explanation:

It can be represented as a fraction

Answer:

198

Step-by-step explanation:

3x11x6=

Answer:

what the question

Step-by-step explanation:

Answer:

13.7

Step-by-step explanation:

I just did the problem

Answer:

$9.28 per t-shirt

Step-by-step explanation:

plz mark brainlest

Answer:

He has enough money to buy 9 t-shirts and he would have 2 dollars left over

Step-by-step explanation:

Divide 65 by 7. You would get 9 with a remainder of 2. So you have enough to buy 9 t-shirts.

Answer:

Step-by-step explanation:

Answer:

16 + 64 + 64 are the 3 sides.

Step-by-step explanation:

There are two sides that are 4 times the third side.

Let the 3rd side = x

4x + 4x + x = 144 inchines

9x = 144 inches

x = 144/9

x = 16 inches.

So the base (which is the smallest side) = 16 inches.

One of the two sides remaining is 4x = 4*16 = 64

The other side = 64

Check

64 + 64 + 16 = 144 as it should.

Answer:

Step-by-step explanation:e

Answer:

They don't have enough money to pay the full price so they have no option but to pay what they have in their saving account. Also as a first down payment its allowed to start from 3% and up. The much down payment the lower they will pay every month.

Step-by-step explanation:

I Hope this Helps You?

What is the volume of this right cone? 40π cm³ 300π cm³ 400π cm³ 480π cm³

✓ The answer is 400pi because the area of a cone is A=1/3*pi*r^2*h1/3*pi*100*12 = 400pi

Check the picture below.