PLEASE HELPPPPPPPPPPP a nuclear disaster at Chernobyl in April 1986, approximately 12,600 kg of radioactive iodine-131 was released into the atmosphere. Iodine-131 is know to decay by half every 8 days. How many kilograms of iodine-131 remained after 24 days?

Answers

Answer 1

Answer:

1575 kg

Step-by-step explanation:

Decay rate formula =

N(t) = No(1/2)^t/t½

No = Initial amount = 12600kg

N(t) = Amount after time t

t½ = half life = 8 days

t = time = 24 days

N(24) = 12600 × (1/2)^24/8

1575kg


Related Questions

Look at this rectangle:
If both dimensions are tripled, then which of the following statements about its
perimeter will be true?
The ratio of the new perimeter to the old
perimeter will be 2:1
The ratio of the new perimeter to the old
perimeter will be 3:1.
The ratio of the new perimeter to the old
perimeter will be 1:2.
The ratio of the new perimeter to the old
perimeter will be 4:1.

Answers

Answer:

Step-by-step explanation:

If you multiply each side by 3, you can find out the answer by calculating it. The perimeter of the red figure is 2*L + 2*W = 2*7 + 2*4 = 14 + 8 = 22

Now let's triple the dimensions. The length of the new rectangle is 3*7 = 21

The width = 4*3 = 12

The perimeter = 2*12 + 2 * 21 = 24 + 42 = 66

What's the relationship?

It is 3 times larger so the ratio is 3:1 which is B

Answer:

i can not see the photo do u have to download it? if so is it safe?

Step-by-step explanation:

Store and he sells jeans for 7/8 of the price at Store B. Store a sells jeans for $35. Write and solve an equation to find the cost of the jeans at store B

Answers

Answer:

$40

Step-by-step explanation:

From the question, Store A sells jeans for 7/8 of the price at store B

Store A= 7/8 of the price at store B

"Of" here means multiplication in mathematics.

Store A= 7/8 × store B price

But Store A sells jeans for $35

Then $35= 7/8 × store B price

To find store B price, just cross multiply, we have

StoreB price= (8×$35)/7

StoreB price=$40

Therefore, the selling price of jeans at store B is $40

X) 2.3.2
Question
What is the length of the hypotenuse of the triangle when x = 10?
7x +41
SX
A
The length of the hypotenuse is about
(Round to the nearest tenth as needed.)
Enter your answer in the answer box and then click Check Answer.
All parts showing

Answers

X= 5 that’s the answer I think I try it’s been a minute

What is the solution to the inequality 2+4x/9 > 4+x

Answers

Answer:

x ≥ −  49/4

Step-by-step explanation:

Morgan won 7 blue ribbons and 4 red ribbons at her horse shows. What is the ratio of red ribbons to blue ribbons she won?

a. 4/11
b. 4/7
c. 7/11
d. 7/4

Answers

B-4/7 ribbons because red goes over blue and there’s 4 red and 7 blue

What did George Washington say to his men just before they got in the boat

Answers

Men, get in the boat

-8(x+12)-8x=3(x-11)+2x

Answers

Answer:

so the answer is x = -3

Step-by-step explanation:

have a nice day!!

Answer:

x = 5.72 repeating

Step-by-step explanation:

first multiply the numbers outside of the parenthesis.

-8x - 96 -8x = 3x -33 + 2x

second we combine like terms.

-16x - 96 = 5x - 33

third we combine the x terms over the equal line.

- 96 = -11x - 33

fourth we add 33 to - 96.

- 63 = -11x

lastly we divide by 11

= 63 divided by 11 = 5. 72 repeating

awnser plssssssssssssssssssssssssssssssssssssss

Answers

Answer-
I think it’s D

Combine any like terms in the expression. If there are no like terms, rewrite the expression.
10wx2+y2z2

Answers

Answer:

Step-by-step explanation:

There is no way that this binomial can be reduced any further. The right term is a 10 a w and an x^2.

The left term is a y^2 and a z^2

There is nothing in common. Just rewrite the entire expression as your answer.

need help asap pleaseee!

Answers

Answer:

Step-by-step explanation:

If two expressions are equivalent, they are the same. If Kayla distributed the three, she would get 3x+6 like Gabriel.

I need help. Someone please help me

Answers

Answer:

A- congruent (the angles are the same)

B- supplementary (they add together to 180 degrees)

C- congruent (the angles have the same measure)

D- congruent (the angles have the same measure)

E- supplementary (they add together to 180 degrees)

F- congruent (the angles are the same measurement)

G- supplementary (the angles add up to 180 degrees)

H- congruent (the angle measures are the same)

Step-by-step explanation:

Answer:

a:congruent

b:supplementary

c:congruent

d:congruent

e:supplementary

f:congruent

g:supplementaruy

h:congruent

Step-by-step explanation:

20 points! Geometry Please help. Will mark brainliest

Answers

Answer:

a b d e

Step-by-step explanation:

The reason is for A. BD=BF is the same length

the reason for B. is that angle one and two combined is a right angle so 90 degrees

the reason for D. is that E is in the middle of DF if you cut it in half where the E is it will be equal to each other

the reason for E. is that is angle three and four combined equals 90 degrees

A block of ice with mass 2 kg slides down a friction less inclined plane that slopes at an angle of 37° below the horizontal. If the block of ice starts from rest, what is its speed after moving a distance of 0.75 m?
8.85 m/s
3.45 m/s
11.9 m/s
2.97 m/s

Answers

Answer:

2.97

Step-by-step explanation:

How do you know whether two quantities x and y are proportional?

A. Every ratio yx for related pairs of x and y is equivalent.
B. Every sum x + y is the same for related pairs of x and y.
C. Every x term is a multiple of the previous term.
D. Every difference x – y is the same for related pairs of x and y. ill mark brainliest

Answers

Answer:

A. Every ratio yx for related pairs of x and y is equivalent

Step-by-step explanation:

Hope this helped!! Have an amazing day!!


find the missing value

Answers

Answer:

y = 20

Step-by-step explanation:

Angles 2 and 4 are vertical angles, so their measures are equal.

m<2 = m<4

62 = 3y + 2

60 = 3y

y = 20

Y=20!

This is because since 2 and 4 are vertical angles they are equal!

62=3y+2

Next subtract 2 from each side

60=3y

And then divide 3 for your answer!


y=20

Ms. Wells is going to order 4 large cheese pizzas for a class pizza party at the end of the school year. She expects she'll spend at least $40 on the pizzas.

a
4x ≥ 40
b
4x 40
d
4x ≤ 40

Answers

Answer:

b im preety shore

Step-by-step explanation:

Answer:

a) 4x is bigger than or equal to 40

Hope this helps and have a great day :)

And please mark this brainliest if you can :)

Select the mathematical terms that mean "opposite of."

Answers

Step-by-step explanation:

reciprocal ; negative ; additive inverse ; and multiplicative inverse . Explanation: The opposite of a number in is a negative. The number we can add to a number to get 0, or the opposite of a number as far as addition goes, is its additive inverse

Answer:

inverse

Step-by-step explanation:

hope this helps:)

math math math aaaa help​

Answers

Answer:

mLM+mMN=mLN

Step-by-step explanation:

Answer:

mLM+mMN=mLN is correct

Step-by-step explanation:

Colin was using the back of his book to check his homework answers. The answer that he had on his paper was −1/3 − (1/5 + 5/8). The correct answer, located in the back of the book, was −1/3 −1/5 + 5/8. Was Colin correct? Justify your response.

Answers

Answer: No. Colin was incorrect.

Step-by-step explanation:

From the question, we are informed that the answer that Colin had on his paper was −1/3 − (1/5 + 5/8) while the correct answer, located in the back of the book, was −1/3 −1/5 + 5/8.

Colin was wrong because he didn't take into effect that the minus has affected the figures in the bracket. Therefore, 1/3 − (1/5 + 5/8) simply means 1/3 - 1/5 - 5/8.

He didn't realise that (-) × (-) = + which has resulted in the change of the sign beside 5/8 from positive to negative.

a bank has 120 customers. Each month the number of customers increases 20 members. Which equation represent the relationship between the number of months the bank has opened,x, and the total customers,y​

Answers

120 + 20x = y


explanation:
while the bank started off with 120 customers so that’s how we’re going to start it off
120 +
then later there is going to be around 20 new members each month which the x will help with that because that will be the x amount of people which you can double, triple, quadruple, that amount etc
120 + 20x
and the y will equal the whatever amount you got
120 + 20x = y

Answer:

120÷20=6 months

Step-by-step explanation:

120÷20=6

Y/20 =X

f(-14) if f(x) = 2x - 3

Answers

Answer:

The correct answer is -31.

Step-by-step explanation:

f(-14) means that x=-14. You have to replace x with -14. Then, you multiply -14 by 2. That is -28. Next you subtract 3 from -28. That gives you -31.

What is the sum of 275 and 325 divided by 25

Answers

(275 + 325) / 25

= 600/25

=24

Answer:

[tex]24[/tex]

Step-by-step explanation:

[tex]275 + 325 \\ =60 0 \div 25 \\ = 24[/tex]

Please mark me as the brainliest

!!!!!!100 POINTSSSSS COMEEE HELPP MEE!!!!!!!!
Look at the box please and read the question carefully
it is not 357
You started the trail with 500lbs. of food.

You now have 282lbs. of food.

What percentage of your starting
amount do you have left?

Percentage (%) of Food Left
(answer) % of (answer)

Answers

Answer:

56.4 % !!!!!!!!!!!!!!!!!!!!!

Step-by-step explanation:

Which of the following numbers is 90 divisible by

2,3,4,5,6,9,10?

Answers

Answer: 2, 3, 5, 6, 9, 10,

Step-by-step explanation:

2,3,5,9,10 is correct

4a x За slove this please​

Answers

Answer:2(2)a(2) x(2)

Step-by-step explanation:

Answer: 4ax+12ay+36az=4a*(x+3a++9z

Step-by-step explanation:

Determine if −3, −23, −43, −63, ... is an arithmetic sequence. If it is, find the common difference.

Answers

Answer:

It is an arithmetic sequence. Common difference: -20

Step-by-step explanation:

First we can find out if it is an arithmetic sequence by seeing how you get from -3 to -23. Then we see to get from -3 to -23, we need to subtract -20. It's the same with -43, so the common difference is -20. And since arithmetic sequences are the only ones common differences, then this is an arithmetic sequence. I hope this helps and I hope it's not wrong, but I do not think it is.

Mrs. Patterson hired a company to mow and clean her lawn. They charge a $25 initial fee and $20 for every hour of yard work. The final cost of the lawn service was $105. Which equation models this situation and is solved correctly to determine the number of hours, h, the lawn company spent cleaning her yard?

A 20h=105: h=5.25
B 25+20h=105: h=4
C 25h+20=105: h=3.4
D 25+20h=105: h=5​

Answers

Answer: B

Explanation: 20x4 = 80+25=105

Name the constants in the expression below.

-8 - 6y + 7 - 8c

Answers

Answer:

-87

I hope this helps!

Answer:=

8

c

6

y

1

Step-by-step explanation:= -8c -6y -1

help please! thank you!!

Answers

Answer:

the answer is (a)

Step-by-step explanation:

GFH is similar to JKH

Verify the identity. To verify the​ identity, start with the more complicated side and transform it to look like the other side. Choose the correct transformations and transform the expression at each step.

Answers

Answer:

Following are the solution to this question:

Step-by-step explanation:

Please find the complete question in the attached file

[tex]\to \frac{\tan x}{\sec x} \\\\\therefore \ \ \ \tan x= \frac{ \sin x}{ \cos x} \ \ \ \ and \ \ \ \ sec x = \frac{1 }{ \cos x}\\\\\to \frac{\frac{ \sin x}{ \cos x}}{ \frac{1 }{ \cos x}} \\\\\to \frac{ \sin x}{ \cos x} \times \frac{ \cos x}{1 }\\\\\to \sin x[/tex]

The numerator transformation value is = [tex]\sin x[/tex]

The denominator transformation value is= 1

After transformation, we get  [tex]\frac{tan(x)}{sec(x)}=sin(x)[/tex]

Trigonometric identity:

We have to verify the identity  [tex]\frac{tan(x)}{sec(x)}[/tex]

As we know that,

    [tex]tan(x)=\frac{sin(x)}{cos(x)}\\\\sec(x)=\frac{1}{cos(x)}[/tex]

So that,

    [tex]\frac{tan(x)}{sec(x)}=\frac{sin(x)}{cos(x)} *cos(x)\\\\\frac{tan(x)}{sec(x)}=\frac{sin(x)}{1}[/tex]

The numerator transform expression is [tex]sin(x)[/tex].

The denominator transform expression is 1.

Learn more about the trigonometric identity here:

https://brainly.com/question/7331447

Complete question: trigonometric expression is  [tex]\frac{tan(x)}{sec(x)}[/tex]

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