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
DanielleElmas [232]
3 years ago
7

The half-life of Plutonium-23 is 30 min. How much of a 1500 mg sample will be left 5 hours from now?

Mathematics
1 answer:
gogolik [260]3 years ago
4 0
Half life means exactly 1/2 of what's left decays
example

if yo has 16grams
if half life is 1 hour, after 1 hour, 8g is left
after another hour, 4g is left
after another your, 2g is left
etc


so find how many half lifes have elapes

so

the amount left after n halflives when you start with P amount is
A=P(1/2)^n

5hr=60*5=300mins
300/30=10
10 half lifves

P=1500
n=10
A=1500(1/2)^10
A=375/256
A≈1.46484g
about 1.5g left
You might be interested in
What are the slope and the y-intercept of the graph of the linear function shown on the grid?
OverLord2011 [107]

Answer:

it looks like you already have the answer but the answer would be slope as -1/3 and y intercept as -6

6 0
3 years ago
-5+2(10b-2)=31 need help thanks!
Contact [7]

Answer:

\Large \boxed{b=2}

Step-by-step explanation:

-5+2(10b-2)=31

Expand brackets.

-5+20b-4=31

-9+20b=31

Add 9 on both sides.

20b=40

Divide both sides by 20

b=2

8 0
4 years ago
Read 2 more answers
For f(x)=3x+1 and g(x)=x^2-6 find (fog)(4)
m_a_m_a [10]
F(x) = 3x+1
G(x) = X^2 - 6
F(G(x)) = F(X^2 - 6) = 3(X^2 - 6) + 1 = 3X^2 - 18 + 1 = 3X^2 -17
F(G(x)) = 3X^2 - 17
6 0
3 years ago
Johnny is reading a novel for the read-a- Thon. The ratio of the number of pages she read to the pages that remain to be read is
mart [117]
There are several ways to answer this question and I will use this approach. Since Johnny reads at a ratio of 7:3 it can be stated that for every 10 pages in a book containing 500 pages Johnny will read 7 of those pages. There are 50 groups of 10 in a 500-page book (50 x 10). Take the ration 7:3 times 50 and use the distributive property:  7:3(50) = (7 x 50):(3 x 50) = 350:150. Based on this Johnny has read 350 pages and has 150 pages remaining.
7 0
3 years ago
Pleas answer the question in the attached file.
ch4aika [34]
A. My best friends, whose name is Laura, is in law school.

You know this because, if you were to take out the part in between the commas, the sentence would still make sense. It just adds additional detail. 
8 0
3 years ago
Read 2 more answers
Other questions:
  • Find a polynomial equation that has zeros at x = −2, x = 0, x = 3 and x = 5
    10·1 answer
  • In need of some help please.
    6·1 answer
  • Susan wants to buy a paddleboat for $840 she'll pay 20% down and pay the rest in six monthly installments what will be the amoun
    11·1 answer
  • On a recent survey, 40% of those surveyed indicated that they preferred walking to running. If 540 people preferred walking, how
    7·1 answer
  • There are k children in a family, and three fewer adults than kids. How many people are there in this family?
    14·1 answer
  • Can you help me please for number 8
    13·1 answer
  • Which expression is w\equivalent to ???<br> HELP PLEASE <br> A<br> B<br> C<br> D
    5·1 answer
  • Help me with this math prob
    8·2 answers
  • 16 gallons of water are used to completely fill 5 fish tanks. If each tank holds the same amount of water, how many gallons will
    5·1 answer
  • A:45<br> B:60 <br> C:90<br> D:180
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!