How much of a radioactive kind of niobium will be left after 105 days if you start with 3,920 grams and the half-life is 35 days?

Answers

Answer 1

Answer:

"490 grams" would be the correct solution.

Step-by-step explanation:

The given values are:

Half time,

T = 35 days

Total time,

t = 105 days

As we know,

⇒ [tex]A=A_o(\frac{1}{2} )^{\frac{t}{T} }[/tex]

On substituting the values, we get

⇒     [tex]=3920\times (\frac{1}{2})^{\frac{105}{35} }[/tex]

⇒     [tex]=3920\times (0.5)^3[/tex]

⇒     [tex]=3920\times 0.125[/tex]

⇒     [tex]=490 \ grams[/tex]


Related Questions

Calculate the size of the exterior angles of a regular polygon which has interior angles of:175⁰

Answers

Answer: 5

Step-by-step explanation: 180-175=5

La suma del triple de un número y nueve veces el mismo número es igual a 120. Hallar el número. 3) Hallar el valor del número z sabiendo que la quinta parte de su tercera parte es igual a 3. 4) Andrés tiene seis veces la edad de Jaime aumentada en 18 e igualada a 36. Hallar la edad de Jaime.

Answers

Answer:

El primer número es 10.

z = 45.

La edad de Jaime es de 3 años.

Step-by-step explanation:

Estos problemas los podemos resolver planteando las ecuaciones:

El triple del número (3X) + 9 veces el mismo número (9X) = 120

3X + 9X = 120

12X = 120

X = 120 / 12

X = 10

El primer número es 10

La quinta parte de z es z/5 la quinta parte de su tercera parte es (z/5)/3 = 3

z/15 = 3

z = 45

6Jaime + 18 = 36

6Jaime = 18

Jaime = 3

La edad de Jaime es de 3 años

explain why guard cells have thicker inner walls and thinner outer walls​

Answers

The inner walls of the guard cells are thick to facilitate the opening of stomatal pore during transpiration. When water enters, outer walls expand which cause the inner walls to draw out causing opening of stomata.


A square has a diagonal with the length of 8V7 inches. What is the length of the
sides?

Answers

Answer:

approximately 13.9 inches

Step-by-step explanation:

That's 8√6, not 8V7.

The four sides are of the same length (x).  According to the Pythagorean Theorem, x² + x² = (diagonal length)² = (8√6)², or

2x² = 64(6) = 384

Dividing both sides by 2, we get:

x² = 192, or x² = 4(48).  Then the side length is x = √16√12, or

x = 4√4√3 = 8√3.  This is approximately 13.9 inches.

49
19) =
112



6
6) =
9

12
7) =
15


63
13) =
77

36
14) =
40





4

240
20) =
320

120
21) =
150

Answers

Answer: 120/21=40/7

49/19

240/20=12/1

36/14=18/7

63/13=63/13

12/7=12/7

6/6=1/1

Step-by-step explanation:

Find the 15th term of the arithmetic sequence 2x+2, 8x-3, 14x-8, ...

Answers

Answer:

86x - 68

Step-by-step explanation:

Answer is attached....

HOPE IT HELPS:)

i need help on this pls

Answers

Answer:

Hello!

1 on the left in vertical and 1 on the right is adjacent hope that helps.

2x - 42 = 94

Solve for x

Answers

Answer:

x = 68

Step-by-step explanation:

2x - 42 = 94

Use inverse operations to add 42 to both sides of the equation.

2x - 42 + 42 = 94 + 42

Simplify this to-

2x = 136

Now divide 2x and 136 by two for-

2x/2 = 136/2

Simplify.

x = 68

The answer, then, is x = 68.

I hope this helps ^^

Good luck :]

constant preportionality y = - 15 / -5

Answers

Answer:

k = 15

Step-by-step explanation:

Answer:

k=15

Step-by-step explanation:

the equation of 2 quantities in direct proportion is

· y=kx. k is the constant of variation

y = 15x is the form

With k=15

PLEEEASE HELP! TEST TMRW AND I MIGHT FAIL.

Answers

7. 36c^2 - 20c^2 - 32c
8. 5y^2 + 17y - 12
9. 5s^3 + 32s^2 - 13s - 10
10. 16p^2 - 1
11. w^2 - 10w + 25
12. 4b^2 + 12b + 9

have a wonderful day! if you need me to explain the steps for all of them in the comments! :)

A car rental company charges $34 per day for a rented car and $0.50 for every mile driven. A second car rental company charges $20 per day and $0.75 for every mile driven. What is the number of miles at which both companies charge the same amount for a one-day rental?

A.
56 miles

B.
54 miles

C.
36 miles

D.
24 miles

Answers

Answer:

B 2/3

Step-by-step explanation:

:)

First you want to make the equations for finding the total price of each rental car. We will say that x is the number of days and y is the number of miles. We will say the price for the first company is A = 34x + 0.50y and the second company is B = 20x + 0.75y. We want to find y where 34x+0.5y = 20x+0.75y and x=1. You should get 56 miles

be smart help me please i’m bout to throw a fit

Answers

Answer:

I would say 1/4 of a chance

i would choose 1/4 percent chance


State the horizontal asymptote of the rational function. F(x) = 5x + 1/ 9x -2

Answers

Answer:

[tex]y=\frac{5}{9}[/tex]

Step-by-step explanation:

For the graph of [tex]y=f(x)[/tex],

the horizontal asymptote becomes [tex]y=\frac{5}{9}[/tex]

which is greater (-27) or (-2-7)​

Answers

Answer:

(-27) is greater I'm pretty sure.

Answer:

(-2-7) is greater than (-27)

1+1=1268934457687423456779052436869867543?

Answers

Answer:

2

Step-by-step explanation:1+1=2 its 2 okay its 2 not 1268934457687423456779052436869867543

I’m no mathematician, but, I’m pretty sure it’s 2, and not 1268934457687423456779052436869867543.

The cookie-stacking competition is a tradition at Westhaven's annual summer festival, and Bert is helping to set it up this year. The first contestant who creates a single stack using all of their cookies wins a prize! After Bert split all the cookies he had evenly among 4 contestants, each contestant got 24 cookies.

Answers

Answer:

is this the full question?

Step-by-step explanation:

It is 1/2 mile from a student's home to a store and back. In a week, she
walked to the store and back home 1 time. In the same week, she rode her
bike to the store and back 3 times. How many miles did she walk and ride
to the store and back in that week? *

Answers

Answer:

2 miles

Step-by-step explanation:

Given that :

Distance from home to store and back = 1/2 mile

In a week :

Number of times he walked from home to store and back = 1 time

Number of times she rode to store and back = 3 time

Note distance does not change whether she rode or walked:

Hence,

miles walked = 1/2 miles * 1 = 1/2 miles

Miles biked = 1/2 miles * 3 = 3/2 miles

Total Number of miles :

(1/2 + 3/2) = (1 + 3) /2 = 4/2 = 2 miles

8÷2(2+2) This is 16 not 1

Answers

Step-by-step explanation:

8÷2(2+2) = 8.

2(2 + 2)

= 8.

4 + 4

= 8.

8

= 1

Answer:

using BODMAS

The answer is 1

Step-by-step explanation:

Bracket Order Division Multiplication Addition and Subtraction

Melanie invested $3800 in an account paying in interest rate of 2 3/8% compounded quarterly Sebastian invested $3800 in an account paying in interest rate of 2 3/4% compounded monthly after 16 years how much more money with Sebastian have in his account then Melanie to the nearest dollar

Answers

Answer:

$317

Step-by-step explanation:

Formula for compound interest is;

A = P(1 + (r/n))^(nt)

For melanie;

P = $3800

r = 2⅜% = 0.02375

n = 12/4 = 3

t = 16 years

Thus;

A = 3800(1 + (0.02375/3))^(3 × 16))

A ≈ $5548

For Sébastien;

P = $3800

r = 2¾% = 0.0275

n = 12

t = 16

Thus;

A = 3800(1 + (0.0275/12))^(12 × 16))

A ≈ 5865

Difference between Sébastien and Melanie's final amount = $5865 - $5548 = $317

2. Three states of matter exist - solid, liquid, and gas. Which of the following are the common properties of liquid?
А It has no definite shape or volume
В. It has definite shape and no definite volume,
С. It has a definite shape and has definite volume
D It has a definite volume but take the shape of the container

Answers

Answer:

I am gonna say D for this one

Answer:

A

Step-by-step explanation:

water has yet to be formed. its molecules move around like crazy so it stays a liquid.

Miss Gonzales opened an account with a deposit of $2,000,
The account earned annual simple interest.
She did not make any additional deposits or withdrawals.
At the end of 6 years, the balance of the account was $2,696.
What is the annual interest rate on this account?

Answers

Answer:

22.5

Step-by-step explanation:

What is the figure shown below?
N
м.
A...line
B..line segment
C..ray

Answers

Answer:

c its Ray I looked on goggle and I looked up Ray and it showed a picture of that

Answer:

Its a ray I didnt need to look it up cause I alr did this before

HELP!!!! Put the following in order from greatest to least.

Answers

Answer:

A

Step-by-step explanation:

A = 9, 7, 5, -2, -6, -8

find the total surface area of the shape

Answers

Answer:

510 ft²

Step-by-step explanation:

in the triangle

base (b) = 5 ft

height of the triangle (h1) = 12 ft

height of the prism = 15 ft

Now

Lateral surface area (LSA)

= perimeter of triangular base * height

= ( 13 + 5 + 12) * 15

= 450 ft²

Total surface area

= LSA + 2 * area of triangular base

= 450 + 2 * 1 / 2 * b * h1

= 450 + 5 * 12

= 450 + 60

= 510 ft²

Hope it will help :)❤

Which is larger? Convert to a decimal using long division. please show your work!!

Answers

Answer:

1.255

Step-by-step explanation:

10^-1 equals 0.1

1÷8=0.125

so our greatest one is 1.255

HELPP WORTH 30 Pts for all plz plz plz help

Answers

Answer:

1. 2ft

2. 8yd

3. 144in

4. 0.5ft

5. 18ft

6. 2640ft

7. 5280yd

8. 4.5ft

9. 4yd

10. 90in

11. 36in=3ft

p=4+5+3=12

12. 3ft=36in

2ft=24in

p=24+24+12+12+36=108

Find the area of the figure

Answers

Answer:

40

Step-by-step explanation:

because 8 times 5 is 40

Answer:

49.82 cm²

Step-by-step explanation:

Answer attached..

Hope it helps ^_^

Write an expression for the perimeter of the square. SIMPLIFY your answer​

Answers

Answer:

P=16x-20

Step-by-step explanation:

The perimeter of a square can be found by adding up all the sides, and since it is a square we know that all the sides are the same. So we get P=4(4x-5), then we distribute the 4, and are left with the equation P=16x-20.


The tires of an automobile have a diameter of 22 inches. If the wheels revolve ten times, how
far does the automobile move? (Round the result to the nearest tenth of a foot.)

Answers

222inches I’m not shure but use photo math for the answer

Can 1.2345 be written as a fraction ?

Answers

Answer:

2469/2000

Step-by-step explanation:

Answer:

Yes.  2469/2000

Step-by-step explanation:

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