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
ivanzaharov [21]
2 years ago
15

Suppose the half-life of a certain radioactive substance is 12 days. Find the time when there will be 20% of the initial substan

ce remaining. Assume you have 1 gram of the original substance.
pls help, it due today
Mathematics
1 answer:
vazorg [7]2 years ago
7 0

Answer: 2.4% I think

12 x 20 / 100 = 2.4%

You might be interested in
Pls help It’s due tomorrow question is in the picture
Slav-nsk [51]

Answer:

C

Step-by-step explanation:

Let's find the area of each of the two circles.

First Circle:

The first circle has a diameter of 10 inches. That means the radius is 5 inches. So, its area is:

A=\pi r^2\\A=\pi (5)^2\\A=25\pi

Second Circle:

The second circle has a diameter twice that of the first. So, the diameter is 20 inches. This means that the radius is 10 inches. Find the area:

A=\pi r^2\\A=\pi (10)^2\\A=100\pi

Now, find the ratio between them by dividing:

\frac{\text{Smaller}}{\text{Larger}}=\frac{25\pi}{100\pi}

Simplify:

\frac{\text{Smaller}}{\text{Larger}}=\frac{1}{4}

1/4 is the same as 1:4

So, our answer is C      :)

5 0
3 years ago
I WILL GIVE A BRANLIEST!<br>What is the graph of the functions?<br> y=2*2^x<br> y=-2*5^x
tekilochka [14]
For this case what you should know is that both functions are of the potential type.
 We have then that
 y = 2 * 2 ^ x
 This function grows exponentially upwards.
 y = -2 * 5 ^ x
 This function grows exponentially downwards.
 Answer
 See attached graphics.

4 0
2 years ago
Complete the following invoice for upholstery fabric.
Degger [83]

Answer:

a) $49.48

b) $220921.91

Step-by-step explanation:

(a) 4 yd @ $12.37 per yd = 4 x $12.37 = $49.48

(b) 271 yd @ 815.21 per yd = 271 x $815.21 = $220921.91

(c) 20% yd @ $4.95 per yd : Here the nunber of yards are missing. Hence could not be answer . However if number of yards is x . The answer would be

20% of 4.95x

(20%=0.20)

0.20 × 4.95x

8 0
3 years ago
What are the x-intercepts of a parabola with a vertex of (-1,-16) and a y-intercept of (0,-15)?
Svetlanka [38]
The vertex-form equation is
  y = a(x+1)² -16
Putting in the y-intercept values, we have
  -15 = a(0+1)² -16
  1 = a . . . . . . . . . . . add 16

Then the x-intercepts can be found where y=0.
  0 = (x+1)² -16
  16 = (x+1)²
  ±4 = x+1
  x = -1 ± 4 = {-5, 3}

8 0
3 years ago
Help please i need this asap !!
Nookie1986 [14]

Answer:

slope is about 1.67

Step-by-step explanation:

2/1.2 ≈ 1.67

hope this helps :)

5 0
3 years ago
Other questions:
  • Determine if the statement is always ,sometimes, or never true.
    14·1 answer
  • Justin is 2 years older than one-third Marissa's age Amy is 4 years older than two times Justin's age then find Justin's age and
    8·2 answers
  • Let l represent an infants length in excess of 50 centimeters and let w represent the median weight of female infants. Make a ta
    8·1 answer
  • Pump it up gym's daily revenue each can be modeled by R(x)=5x where x represents the number of customers that visit the gym each
    10·1 answer
  • HELP ASAP!!!!!!!!!!!!!!!!!!!
    5·1 answer
  • Raymond's age plus two times Melanie's age equals 75. Raymond is 3 years older than Melanie. How old is Melanie? ?​
    9·2 answers
  • PLEASE HELP ME ASAP ITS A EXAM
    6·2 answers
  • Ayo take some points you deserve them
    9·1 answer
  • Pls help. I am not very smart!
    14·2 answers
  • The regression equation y equals negative 0.414 x plus 106.55 approximates the percent of people in an audience who finish watch
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!