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
Aleks [24]
2 years ago
9

a radioactive substance has a half-life of 2 seconds. A scientist begins with a sample of 20 grams. How much of the substance re

mains after 8 seconds?
Mathematics
1 answer:
s344n2d4d5 [400]2 years ago
5 0

Answer:

1.25 g

Step-by-step explanation:

you start with 20g at 0 seconds.

divide by half after 2 seconds and you have 10g.

at 4 seconds you have 5g.

at 6 seconds you have 2.5g.

at 8 seconds you have 1.25g.

You might be interested in
Type the correct answer in each box. if necessary, round your answers to the nearest hundredth
Vesnalui [34]

Answer:

i need the problem

Step-by-step explanation:

plas give problem so i couuld solve


6 0
2 years ago
Read 2 more answers
What is -3m-8v-4m+5v
vladimir1956 [14]
I hope this helps you



-3m-4m-8v+5v


-7m-3v
3 0
3 years ago
Read 2 more answers
To rent a canoe costs $15 for the first hour and $12 for each additional hour or fraction of an hour. Which point is NOT include
pogonyaev

Answer:

A

Step-by-step explanation:

(2.5,39)

8 0
3 years ago
Write an equation in slope-intercept form for the line that is parallel to y=−4x−3 and that passes through the point (−2,4).
kirill115 [55]

Answer:

The Correct option is Last one y=-4x-4

Therefore, equation of the line in slope-intercept that passes through (-2,4) and is parallel to the line y=-4x-3 is y=-4x-4

Step-by-step explanation:

Given:

y=-4x-3

To Find:

Equation of line passing through ( -2, 4) and is parallel to the line y=-4x-3

Solution:

y=-4x-3 ..........Given

Comparing with Slope-Intercept form,  

y=mx+c

Where m =slope  

We get

Slope = m = -4

We know that parallel lines have Equal slopes.

Therefore the slope of the required line passing through (-2 , 4) will also have the slope = m = -4.

Now the equation of line in slope point form given by

(y-y_{1})=m(x-x_{1})

Substituting the points and so we will get the required equation of the line,

(y-4))=-4(x-(-2))=-4x-8\\\\y=-4x-8+4=-4x-4\\\\y=-4x-4......Equation\ of\ line

Therefore, equation of the line in slope-intercept that passes through (-2,4) and is parallel to the line y=-4x-3 is y=-4x-4

8 0
3 years ago
What is the square root of 18 rounded to the nearest tenth
ratelena [41]

Answer: 4.2

Step-by-step explanation:

when you square root 18 you get 4.242. When rounded to the nearest tenth you get 4.2 since 4 is not nor is 5 and exceeds it.

8 0
3 years ago
Read 2 more answers
Other questions:
  • If a show has 16 people and they lose 2 people every episode how may episodes will there be.
    10·1 answer
  • At the beginning of every year, Molly deposits $200 in a savings account that offers an interest rate of 20%, compounded annuall
    12·2 answers
  • What is 8h =112 plz help me
    5·2 answers
  • How many tires are there if you have 10 bicycles?
    6·2 answers
  • A) Simplify the expression and explain each step
    11·1 answer
  • Organisms are present in ballast water discharged from a ship according to a Poisson process with a concentration of 10 organism
    15·1 answer
  • Choose the most convenient method to graph the line 2x+5y=−10.
    7·1 answer
  • If the graph of a linear equation is translated 4 units down, which statement best describes the change to the equation?
    5·1 answer
  • PLEASE HELP
    9·1 answer
  • Which interval contains the most data values?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!