16. A radioactive isotope has a half-life of 13 hours. Find the amount of the isotope left from a 400-milligram
sample after 65 hours. If necessary, round your answer to the nearest thousandth.
a. 25 mg
c. 0.049 mg
b. 7.692 mg
d. 12.5 mg
Please help. I only see answers for 52 hours

Answers

Answer 1

Answer:

Without the math: 65 hours is 5 half-lives

13 hrs = 1/2

26 hrs = 1/4

39 hrs = 1/8

65 hrs = 1/32

(1/2)^5 = 1/32

400 mg / 32 = 12.5 mg   that is, after 5 half-lives


Related Questions

FIND THE THE
MISSING ANGLE:
31°
29

Answers

Answer:

120°

Step-by-step explanation:

31 + 29 = 60

180 - 60 = 120

42.44 I believe is the answer

The table represents some points on the graph of a linear function.
Х
-1
5
7
11
у
6
3
2.
o
What is the rate of change of y with respect to x for this function?
2
O
2
-2

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Answer:

should i provide formula

which of the following could be factored by grouping?
a. wy+wz+xy-xz
b. wy+yz-wx+yz
c. wy+wz+xy+xz
d. wx+wz-wy+wv

Answers

Answer:

wy+wz+xy+xz

Step-by-step explanation:

C.) wy+wz+xy+xz  could be factored by grouping.

What is factorization by grouping?

Method of factorization by grouping the terms:

(i) From the groups of the given expression a factor can be taken out from each group.

(ii) Factorize each group.

(iii) Now take out the factor common to group formed.

= wy + wz + xy + xz

= w(y+z) + x(y+z)

= (w+x)(y+z)

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please find the sum of difference of (-12) + (-38)

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-50
Signs are same , you need to add them

seven multiplied to the sum of twelve and four

Answers

I think the answer is 112

Answer:

I think answer is the 112

R
56
30°
T
S
What is the measure of Angle R?
plz help

Answers

Answer:

94

Step-by-step explanation:

180-30-56=94 degrees

What is the first step in solving the inequality m-2/6 < -1?
O Multiply both sides by 6.
O Add 2 to both sides.
O Change the direction of the inequality.
O Change the inequality to s.
HELP IM ON A TIMED TEST​

Answers

Step-by-step explanation:

change the directions i think

you have to make the -1 -> 0

you have to multiply by -1

and if you multiply the direction will change

The answer to a statistical question includes variability in data. Choose ALL examples of statistical questions es A) How much do the animals on the farm weigh? B) How old are all the teachers at the school? How old is the oldest teacher at the school? D How much does the black and white puppy weigh? E) How many students ate lunch in the cafeteria today?​

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Answer:

A and C

Step-by-step explanation:NLE Choppa said so

Answer:

a and c

Step-by-step explanation:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Answer:

where is the coordinate plane?

Step-by-step explanation:

Answer:

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i think it’s maybe d i’m not for sure.

PLEASE HELP!! LMNP is rotated 90° clockwise around the origin. What are the coordinates of M’

Answers

Answer:

The answer is "(4, -5)".

Step-by-step explanation:

Please find the complete question in the attached file.

In the given image file when we rotate it to 90 degrees clockwise so the value as the rule is [tex](x, y) \longrightarrow (y, -x)[/tex]

Putting the value in x = 5 and y = 4 then:

[tex](5, 4) \longrightarrow (4, -5)[/tex]

Select the correct
nswer.
Which of these tables represents a function?
Х
у
Х
у
х
у
Х
у
2
3
3
2
13
-3
-2
8
4
5
5
4
12
0
o
9
6
3
3
6
10
3
1
8
7
5
5
7
13
6
- 2
9
W.
x.
Y.
Z.
OA. W
OB. X
Oc. Y
OD. Z
Type here to search
BI
1

Answers

Answer:

A. W

Step-by-step explanation:

The table in which each x-value is related to exactly one y-value is the table that represents a function.

Form the tables given, in table W, every x-value (input) has exactly one y-value (output) that is related to it.

The correct table that represents a function is table W

Functions and Tables

For a table of values to be a function, the input values also known as the domain of the function must NOT have a repeated values.

All values of the domain must have a unique values in the codomain for a table of values to be a function.

From the given table, you can see that table X, Y and z all have repeated values in the domain column. This shows that these tables do not represent a function

Hence the correct table that represents a function is table W

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Write the quadratic equation in standard form:
-3x^2 + 2x + 6 = -x^2

Answers

Answer:

Hi! The answer to your question is -2x^2+2x+6=0

Step-by-step explanation:

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☆Brainliest is greatly appreciated!☆

Hope this helps!!

- Brooklynn Deka

THIS IS NOT NEEDED FOR ANSWERING JUST TO GET THREE NEEDED QUESTIONS I NEED ANSWERED TODAY OUT INTO BRAINLY... AND ID EXPECT NO LINKS IN THIS OR IN THESE QUESTIONS... BUT I WILL PUT THE THREE QUESTIONS AS PHOTOS IN HERE IF YOU WANT TO ANSWER THEM HERE INSTEAD AS PHOTOS... IF YOU CANT SEE THEM HERE THEN GO INTO THE BRAINLY QUESTION LINKS
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Answers

Answer:

huh i am very confused

Step-by-step explanation:

ok got it :DHave a great day!!

Question 2 (1 point)

What is the length of a day-night cycle? Is it the same everywhere on Earth?

12 hours - yes; because the sun rises and sets in the exact same place every day

relative to Earth.

12 hours - no; because depending on where you are on Earth, you have a

different amount of sunlight.

24 hours - yes; because the sun rises and sets in the exact same place every day

relative to Earth

24 hours - no; because depending on where you are on Earth, you have a

different amount of sunlight.

Answers

Answer: 24 hours - no; because depending on where you are on Earth, you have a  different amount of sunlight.

Step-by-step explanation:

The day-night cycle is a complete day or a complete rotation of the earth around its axis. This takes 24 hours which is why 24 hours is the length of a full day.

People around the world however, do not get the same amount of sunlight or darkness and this is because of where they are on Earth. Due to the way the planet is tilted on its axis, some areas see sunlight more than other in a period and others see more darkness.

whats the answer to this ​

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Answer:

Maybe 5?

Step-by-step explanation:

If not im really sorry!!!!!!!

What percent of 513 is 248

Answers

Answer:

48.34%

Step-by-step explanation:

Answer:

48%

Step-by-step explanation:

248/513 is .483430799, so rounded is 48%

A card is randomly selected from a standard deck of 52 cards.what is the probability that it is a 10 or a face card?

Answers

Answer:

In a deck of cards, there are 6 faced cards. So, the probability of drawing a faced card is 6 out of 52 cards. Thus, the probability of drawing a face card from a deck of cards is 6/52 = 3/26.

Step-by-step explanation:

Answer:

4/13

Step-by-step explanation:

There are 4 10 cards.

There are 12 face cards.

Probability of both:

4/52 + 12/52 = 16/52 = 4/13

Adina has a total of $1.65 in nickels and dimes. The number of dimes is 6 more than the number of nickels. How many coins are there of each type?



Choose the correct system of equations needed to solve this problem.

A
0.10d+0.05n=60.10d+0.05n=60.10d+0.05n=6

n+d=1.65n+d=1.65n+d=1.65

B
d=n+6d=n+6d=n+6

0.05n+0.10d=1.650.05n+0.10d=1.650.05n+0.10d=1.65

C
n=d+6n=d+6n=d+6

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D
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0.05n+0.10d=1.650.05n+0.10d=1.650.05n+0.10d=1.65

Answers

Answer:

C

Step-by-step explanation:

If you divide 1.65 by 6 you'll get 0.275 so then you'll add d+6n to get d+6 and then you'll solve the question for 6n and you'll get 1.65

Can you help me plz? I'll mark brainilest

Answers

the answer is amplitude

RU and TU are tangent to OS. Find mZR.
A. 63°
B. 54°
C. 126°
D. There is not enough information to determine

Answers

Answer:

A. 63

Step-by-step explanation:

EDGU 2020

PLEASE DUE IN 5 mins

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Answer:

am i too late

Step-by-step explanation:

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Answers

Answer:

Integer is a whole number; a number that is not a fraction.

Step-by-step explanation:

Pls help me!!!! Im stuck!!!

Answers

Answer:

has no solution.

Step-by-step explanation:

you can see that the two equations are almost identical except for the fact that one is multiplied by 7, but it isnt completely multiplied correctly so there would be no solutions.

Answer:

infinite solutions  

Step-by-step explanation:

you can solve this by the elimination method. take the rover a equation and multiply it by -7 and then combine the equations. when you do this, you can see that either side equals 0 which means that there are infinite solutions.

-7(y= 1.5x - 6) which equals the equation below

-7y= -10.5x-42 then combine the other equation

7y=10.5x+42 and that equals

0=0

What is the rock cycle? Select the best two answers from the choices below.

a
The primary indicator of climate change
b
A series of processes that create and transform the types of rocks in Earth's crust
c
A concept in geology that describes transitions and relationships among the three main rock types
d
A way to show how Earth's different spheres interact with one another

Answers

Answer:

A concept in geology that describes transitions and relationships among the three main rock types

please mark as brainliest.

Answer:

b. A concept in geology that describes transitions and relationships among the three main rock types. and

c. A series of processes that create and transform the types of rocks in Earth's crust

Step-by-step explanation:

ive studied and this is correct because i took the test and i  got it correct

please give me 5 stars

write as y=mx+b
passes through (-3,7) with a slope of [tex]\frac{3}{2}[/tex]
passes through (7,0) and 0,-5)

Answers

Answer:

yrheyetegegetehegehehdhdbdhehehehrhrhthrjfucchffjjd ftfju

Select all expressions that are equal to 3 1/4.
What answer is it.
26x1/8 2 1/8 ×2 4×13 1/4×3 13×1/4

Answers

Answer:

13×1/4

Step-by-step explanation:

turn into improper fraction

Drag numbers to the table so it shows a proportional relationship between x and y.

Answers

Sorry but you didn’t put a table but at least I can answer this a table can be shown by following the same rule by adding, subtracting, multiplication or division. Sorry for the inconvenience!

Answer

Sorry but you didn’t put a table but at least I can answer this a table can be shown by following the same rule by adding, subtracting, multiplication or division. yeah thats right

Step-by-step explanation:

cant not solve unless u explain

for triangle FGH, angles F and G are known, as is the length of side h. Which method should be used to start solving triangle FGH?

- neither law can be used
- law of sines
- law of cosines
- both laws can be used

Answers

Answer:

Law of sines

Step-by-step explanation:

i took the test

The law of sines can be used to calculate the side h. Hence, option B is correct.

What is trigonometry?

The branch of mathematics sets up a relationship between the sides and the angles of the right-angle triangle termed trigonometry.

For triangle FGH, angles F and G are known, as is the length of side h. The sin angle is the ratio of the perpendicular to the hypotenuse we can calculate one side by using the sine angle.

Hence, Hence, option B is correct.

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