Hello guys, plz help me with this question ASAP! Plz show the working, THANK YOU BROTHER

Hello Guys, Plz Help Me With This Question ASAP! Plz Show The Working, THANK YOU BROTHER

Answers

Answer 1

Answer:

5.5 min

Step-by-step explanation:

At time t=0 you have 72 grams

at time t = 22 min you have 4.5 grams.

Now

4.5/72 = (1/2)^(t/half-life)

and t=22, so

4.5/72 = (1/2)^(22/half-life)

taking log of both sides:

log(4.5/72)=(22/half-life)log(1/2)

solving for half-life gives half-life = 11/2 = 5.5min


Related Questions

Apples are sold in bags of 6 and pears are sold in bags of 8. Jerry wants to buy the same number of each. What is the least number of apples and pears Jerry needs to buy?

Answers

Answer:

6

Step-by-step explanation:

Apples are sold in bags of 6

Pears are sold in bags of 8

Jerry wants to buy the same number of each fruits

Therefore the least number apples and pears that Jerry needs to buy is 6

Look at the photo pick A B C D either one explanation not needed thank you! <3 don’t guess D IS IV

Answers

Answer:

D. IV

General Formulas and Concepts:

Algebra I

Reading a Cartesian Plane

Step-by-step explanation:

When we label a Cartesian Plane, we label counterclockwise starting at the top right corner:

Top Right Corner = 1st Quadrant

Top Left Corner = 2nd Quadrant

Bottom Left Corner = 3rd Quadrant

Bottom Right Corner = 4th Quadrant

We see that point B is in the Bottom Right Corner. Therefore, it is in the 4th Quadrant and our answer would be D.

Answer:

B is in IV quadrant

Step-by-step explanation:

Count it conterclockwise, begin at the top right corner

The graph of a linear system is shown.

What is the solution to this linear system? Enter a value in each box to create an ordered pair.

( , )

Answers

Answer:

uh its been 2 weeks so, good luck!

Step-by-step explanation:

The rope is 50,000 millimeters.How long is the rope in meters

Answers

Answer:

50

Step-by-step explanation:

trust me

Answer:

0,05 Km

keksdkdkkckfkvkvkvv

What is 10290292029029298383746473536256353773637363763737373773736366363536536343637825231+100000

Answers

answer:

1.0290292e+82

Step-by-step explanation:

asked my bed

A movie theater charges $6 for one adult ticket and $3 for a child ticket. One night, the movie theater earned a total of $1, 428 from tickets sold. If 56 more children than adults attended the movie theater that evening, how many children attended

Answers

Answer:

The answer is A

Step-by-step explanation:

ldentify the domain and range of each function.
y=3•5
The domain of this function is
The range of this function is

Answers

Answer:

The domain of this function is:

C.) Negative infinity to infinity

The range of this function is:

A.) 0 to infinity

Y=4^x-5+3

The domain of this function is:

C.) Negative infinity to infinity

The range of this function is:

B.) 3 to infinity

Answer:

Answer:

Domain : R

Range : R

Step-by-step explanation:

The given function is  or it can be written as y = 15x.

So, the function is valid for all real values of x and we will get the real value of y for each real value od x.

Hence, all the real numbers or R is the domain of the function.

And all the real numbers or R is the range of the given function. (Answer)

the domain is the set of x -values, the range is the set of y-values. I would have to say the domain is : R [ negative intinity, to infinity]. Equally, I would have to say the range is R [ Negative infinity,  to infinity]

Step-by-step explanation:

Why, because no set is defined for either x or y.

which expression is equivalent to the given expression is no denominator equals zero?​

Answers

Answer:

B: 4/d-6

Step-by-step explanation:

Plato answer

Guys please help me with this question

Answers

Answer:

Colin will have to wait for 2 hours for the pond to completely empty

Step-by-step explanation:

Volume of a Prism

The volume of a prism of base area Ab and height H is computed with the formula:

V=Ab.H

We are given a pond in the shape of a prism with a trapezoidal base (front view).

The area of a trapezoid of bases b1 and b2, and height a, is given by:

[tex]\displaystyle A_b=\frac{b_1+b_2}{2}.a[/tex]

The parallel bases of the trapezoid have measures of b1=0.6 m and b2=1.4 m, and the height is a=2 m, thus the area is:

[tex]\displaystyle A_b=\frac{0.6+1.4}{2}*2[/tex]

[tex]A_b=2\ m^2[/tex]

The height of the prism is H=1m, thus the volume of the pond is:

[tex]V=2\ m^2*1\ m[/tex]

[tex]V=2\ m^3[/tex]

It's also known the level of the pond goes down by 20 cm (0.2 m) in the first 30 minutes. Note at this moment the level is still at the rectangular prism zone of the pond, thus the volume of water is calculated as the area of the face of water by the height it went down:

[tex]V_w=1\ m*2\ m*0.2\ m = 0.4\ m^3[/tex]

The pond still has this volume of water:

[tex]V_p=2\ m^3-0.4\ m^3=1.6\ m^3[/tex]

The pond was drained [tex]0.4\ m^3[/tex] in 30 minutes, thus the rest of the water will be taken out in

[tex]\frac{1.6}{0.4}*30 =120\ min[/tex]

Thus, Colin will have to wait for 2 hours for the pond to completely empty

PLEASE ANSWER SOON

Multiply.

−2 1/3⋅1 1/2

Enter your answer, in simplest form, in the box.

Answers

Answer:

its 7/2

Step-by-step explanation:

Which of the following correctly describes the graph of - 5/2 f(x)

Answers

Answer:

B

Step-by-step explanation:

Answer:

A

Step-by-step explanation:

Gets Narrow, and opens opposite direction

Calculate the marked price of a sweater purchased at Rs. 1075 allowing 14% discount. ( please do proper answer )​

Answers

Answer:

Rs. 1250

Step-by-step explanation:

The sweater is purchased at Rs. 1075

The discount is 14%

Let y represent the marked price of the sweater

y × 14% = 1075

y × (100-14)/100= 1075

y × 86/100= 1075

y ×0.86= 1075

0.86y= 1075

Divide both sides by the coefficient of y which is 0.86

0.86y/0.86 = 1075/0.86

y = 1250

Hence the marked price is Rs. 1250

Solve for x

6.78x - 5.2 = 4.33x + 2.15

HELPPP

Answers

Answer:

x = 3

Step-by-step explanation:

6.78x - 5.2 = 4.33x + 2.15

6.78x - 4.33x = 5.2 + 2.15

2.45x = 7.35

x = 7.35/2.45

x = 3

Thus, The value of x is 3

-TheUnknownScientist

what is the coefficient ​

Answers

Answer:

coefficient of what?

Step-by-step explanation:

I will give brainlest to the best answer!!!!

Answers

Answer:

-3,9

Step-by-step explanation

2 to -4 would take 6 units down and 8-1 is 7 and 7+2 is 9.

hope this helps!

What is the missing number in the equation?

3/10 x ? = 21/10

Answers

Answer:

7 , or 7/1

Step-by-step explanation:

Let ? = x. Set the equation:

(3/10)x = 21/10

Isolate the variable, x. Multiply 10/3 to both sides of the equation:

x * (3/10) * (10/3) = (21/10) * (10/3)

x = 21/10 * 10/3

Simplify the equation. Divide common factors from both the numerator and denominator, and then simplify:

x = (21 * 10)/(10 * 3)

x = (21/3) = 7/1 = 7

x = 7

3/10 x 7
21/10
Answer is 7

PLEASE HELPP
Combine like terms: 22r-18-10r
A: 12r+18
B: 12r-18
C: -6r
D: -4r-10

Answers

Answer:

B: 12r-18

Step-by-step explanation:

22r-10r = 12r

and -18 doiesnt have anythign to combine with

12r-18

Erica has 8 squares of felt, each with area 16. For a certain craft project she cuts the largest circle possible from each square felt. What is the combined area of the excess felt left over after cutting out all the circles?

A) 4(4-π)
B) 8(4-π)
C) 8(π−2)
D) 32(4-π)
E) 16(16-π)

Answers

Answer:

Concept: Area Analysis

Given: 8 sq of felt They have an area of 16 each.We want to maximize the area of a circle without cutting outside the square.So we can have a circle with diameter 8 Hence 4(4-pi)

Abby's curtain company is making curtains for a local hotel. She wants each curtain to be 48 inches long. At the fabric store, fabric is sold by the foot. If Abby's curtain company wants to make 55 curtains, how many feet of fabric will she need? 1 inch = 1 12 foot

Answers

Answer:

220 ft

Step-by-step explanation:

Given that:

Length of each curtain = 48 inches

Number of curtains required for Abby's curtain company = 55

Fabric of curtains is sold by the fabric store foot by foot.

Unit for conversion:

1 inch = [tex]\frac{1}{12}[/tex] foot

To find:

The fabric (in feet) needed by Abby.

Solution:

First of all, let us convert the length of each curtain (which is given in inches) to feet.

As per given hint:

1 inch = [tex]\frac{1}{12}[/tex] foot

48 inches = [tex]\frac{1}{12}[/tex] [tex]\times[/tex] 48 ft = 4 ft

So, length of one curtain is 4 ft.

Now, number of curtains required are 55.

Therefore, total length of curtains required can be found by multiplying the number of curtains with the length of one curtain.

Total length of curtain required = 55 [tex]\times[/tex] 4 = 220 ft

Fred bought 320 square
feet of plywood to make
the triangular shed shown
here If he used plywood
for all parts of the shed
(including the bottom)
how much did he
have left over?

Answers

Well I’m unable to answer that since I don’t have a photo of his shed.

2 triangles are shown. The first triangle has side lengths x, x, 50. The second triangle has side lengths 45, 45, 75. What value of x will make the triangles similar by the SSS similarity theorem? 1.5 20 30 67.5

Answers

Answer:

30

Step-by-step explanation:

yes I can tell what it is

The value of x that will make the two triangles similar by the SSS similarity theorem is: C. 30.

What is the SSS Similarity Theorem?

According to the SSS similarity theorem, if all the three corresponding sides of two triangles are proportional or have the same ratio, then both triangles are similar.

If the two triangles are similar we would have:

75/50 = 45/x

Cross multiply and find x

x = (45 × 50)/75

x = 30

Thus, the value of x would be: C. 30.

Learn more about the SSS similarity theorem on:

https://brainly.com/question/4163594

#SPJ9

One-third cup of black beans provides 20% of the potassium you need daily. You must get the remaining 1,360 milligrams from other sources.

How many milligrams of potassium should you consume daily?

___ milligrams

Answers

80 percent of needed milligrams is 1360
so

1360/.80 = x/1

Answer: 1700 milligrams

please help me on this!

Answers

Answer:

[tex] {9}^{ - 8} [/tex]

Step-by-step explanation:

[tex] \frac{ {9}^{ - 5} }{ {9}^{3} } [/tex]

[tex] {9}^{ - 5 - (3)} [/tex]

[tex] {9}^{ - 5 + (- 3)} [/tex]

[tex] {9}^{ - 8} [/tex]

Solve 4(2x/3+8)=40 X=?

Side note: 2x/3 is a fraction

Answers

9514 1404 393

Answer:

  x = 3

Step-by-step explanation:

Undo what has been done to the variable.

  4(2x/3 +8) = 40

  2x/3 +8 = 10 . . . . . divide by 4

  2x/3 = 2 . . . . . . . . . subtract 8

  x = 3 . . . . . . . . . . . . multiply by 3/2

PLZ HELP ASAP MARKING BRAINLIEST

Answers

Answer:

1. Increase

2. Decrease

3. Increase

4. Decrease

Step-by-step explanation:

Simplify 7/3 - 4 V6 + 48 - 54.


(20 points)

Answers

Answer:

option B

Step-by-step explanation:

7 sq rt 3 cannot be simplified

4 sq rt 6 cannot be simplified

sq rt 48 = (sq rt 12 · sq rt 4) = (sq rt 4 · sq rt 4 · sq rt 3) = 4 sq rt 3

sq rt 54 =  (sq rt 9 · sq rt 6) = 3 · sq rt 6

combine each pair of like terms:  (7 sq rt 3 + 4 sq rt 3) =  11 sq rt 3

                                                        (-4 sq rt 6 - 3 · sq rt 6) = -7 sq rt 6

If m
then m ABC = [ ? ]


ILL MARK WHATEVER ANSWER RIGHT BRAINLEST

Answers

Answer:

it is 120

Step-by-step explanation:

Gavin ran 2 3/5 miles in 7/12 of an hour. How many miles can Gavin run in one hour?

Answers

Answer:

First you find how many miles can Gavin run in 1/12 of an hour. That way you can use it to times 12 and to find 12/12 of an hour which is 1 hour.

Turn it into an improper fraction. 2×5=10 then add that 10 to the numerator 3 and it'll be 13/5 miles in 7/12 hours. Then divide it by 7.

[tex] \frac{13}{5} \div 7 = \\ \frac{13 }{5 \times 7} = \frac{13}{35} [/tex]

So 13/35 is how many miles Gavin runs in 1/12 of an hour. Now times is by 12 = 146/35

Or

[tex]4 \frac{6}{35} [/tex]

miles per hour

Help I’m on gradpoint!!!

Answers

Answer:

The first answer i think.

Step-by-step explanation:

select all the line that have a slope of 5/2​

Answers

c, e are your answers
c and e are your answers
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