1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Igoryamba
2 years ago
14

One hundred grams of radium are stored in a container. The amount RR (in grams) of radium present after tt years can be modeled

by R=100e−0.00043tR=100e−0.00043t. After how many years will only 5 grams of radium be present? Round your answer to the nearest whole year.
Mathematics
1 answer:
drek231 [11]2 years ago
8 0

Answer:

6967 years

Step-by-step explanation:

Given the exponential function :

R=100e−0.00043t

Time = t in years

R = final amount

Number of years in which only 5 grams of radium will be present :

R = 5

Plugging into our formula :

5 = 100 * e^−0.00043t

5 / 100 = e^−0.00043t

0.05 = e^−0.00043t

Take the In of both sides

−2.995732 = - 0.00043t

t = −2.995732 / - 0.00043t

t = 6966.819

t = 6966.819 years

t = about 6967 years

You might be interested in
−3x^ 2 +6x+9=<br> factor
GrogVix [38]

Answer:

the answer in factor form would be

-3(

7 0
3 years ago
1. Translate the variable expression into a word phrase: 4b – 2
nevsk [136]
1. 4b - 2 : the product of 4 and a number (b) decreased by 2

2. the sum of 15 and 4 times a number......15 + 4x

3. 8 fewer boys then girls...how many boys.......b = g - 8

4. It will be less then 1 because of the negative exponent....a negative exponent will mean the number is less then 1...I dont really know how else to explain it.

5. Doug is twice Anna's age...doug is 34 years old
   I dont know the 5 step plan...but I am putting what I do know

   d = doug's age
   a = anna's age
   
   d = 2a
   d = 34
   
   34 = 2a
   34/2 = a
   17 = a....so anna is 17

   check..
   d = 2a
   d = 2(17)
    d = 34 (correct)
7 0
2 years ago
Read 2 more answers
How many people have a membership?​
Ymorist [56]

Answer:

38 people have a membership.

Step-by-step explanation:

That's because the bottom row shows how many years they've had the membership.

And the y axis shows how many people or the frequency of people having the membership for that amount of years.

So its a bar graph that shows you how many of the members have had the membership for a set amount of years.

So all you have to do is add up each column,

0-2 years = 6 people

2-4 years = 8 people

4-6 years = 10 people

6-8 years = 8 people

8-10 years = 6 people

6 + 8 + 10 + 8 + 6 = 38

6 0
3 years ago
What is the area of a sector that has a radius of 25 mm and has an angle measure of 50
attashe74 [19]

Answer : The area of sector is, 272.57mm^2

Step-by-step explanation :

Formula used to calculate the area of sector in degree is:

Area of sector = \frac{\theta}{360}\pi r^2

where,

\theta = angle = 50^o

r = radius = 25 mm

Now put all the given values in the above formula, we get:

Area of sector = \frac{\theta}{360}\pi r^2

Area of sector = \frac{50}{360}\times 3.14\times (25)^2

Area of sector = 272.57mm^2

Therefore, the area of sector is, 272.57mm^2

7 0
3 years ago
As an estimation we are told £3 is €4.
Kruka [31]

Answer:

£8.10

Step-by-step explanation:

Since we have to convert Euro to pound we will first find value of one euro in terms of pound.

Given

£3 = €4

=> £3/4 = €1

=> €10.80 = £3/4 * 10.80  ---->multiplying both side by 10.80 as we have have to find value of €10.80  in pounds

= > €10.80 = £8.10

6 0
3 years ago
Read 2 more answers
Other questions:
  • (a) Find the differential dy.
    7·1 answer
  • Point Q is the midpoint of GH. GQ=2x+3, and GH=5x−5 .
    11·1 answer
  • If lena has 5 kids and she has 9 more but loses 3 kids then she found 19 kids so she just kept them. how many kids now does she
    8·2 answers
  • Douglas invests money in two simple interest accounts. He invests three times as much in an account paying 14% as he does in an
    10·2 answers
  • In Exercise,Use properties of exponents to simplyfy the expression.<br> (e2/3)(e3)
    14·1 answer
  • Coins were developed as a medium of exchange because other items like cows, grain, and land were more difficult to move from pla
    9·2 answers
  • Type the next term in the sequence. 15, 12, 9, 6,
    15·2 answers
  • Which expression is equal to 48 + 72?
    6·2 answers
  • 25x²+0x-1<br><br> Factor completely<br><br> Please provide an explanation if able
    9·2 answers
  • 6. Andy scored 90 on the last history exam. He scored 81 this time. By what percent did his score decrease?​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!