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
kenny6666 [7]
3 years ago
6

PLEASE HELP 20 POINTS

Mathematics
2 answers:
Anika [276]3 years ago
7 0
Hello!

A sample of Bromine-82 begins at 80 mL. We are given that this value will decrease by half of its current amount every 35 hours. First, we'll determine the number of times that 35 goes into 140. This will reveal the number of times we should divide the sample by 2:

140 ÷ 35 = 4

We have now proven that there are 4 periods of 35 hours in 140 hours. This means that we will divide the sample in half a total of 4 times, as follows:

1. 80 ÷ 2 = 40
2. 40 ÷ 2 = 20
3. 20 ÷ 2 = 10
4. 10 ÷ 2 = 5

We have now proven that an 80 mL sample of Bromine-82 will be reduced to only 5 mL after 140 hours. Therefore, the correct answer is 5 mL.

I hope this helps!
PSYCHO15rus [73]3 years ago
3 0
To solve this problem, we have to use the half-life formula, where <em>A</em> represents the remaining amount, <em>P</em> is the initial amount, <em>t</em> is the time that has passed, and <em>h</em> is the substance's half-life:

A = P( \frac{1}{2} )^{\frac{t}{h} }

This is what it looks like with the values from this scenario plugged in:

A = 80( \frac{1}{2} )^{\frac{140}{35} } \\ A = 5

There are 5 mL of the 80 mL Bromine sample left after 140 hours.
You might be interested in
Using the distributive property to factorize the equation 3x^2+24x=0, you get ​
Natalka [10]

Answer:

Step-by-step explanation:

3x^2+24x=0\\factor: 3x(x+8)=0\\x=0, -8

6 0
3 years ago
Read 2 more answers
Mitch has 50 pieces of licorice. He shares them equally with his sister.
leonid [27]
50/2=L is the a expression 
7 0
3 years ago
Read 2 more answers
What are narcissistic numbers
konstantin123 [22]
69,420,911,80085 and that’s all
6 0
3 years ago
Equation of the line contains the points (-3,2) and (5,-5)
makkiz [27]

For this case we have that by definition, the equation of the line of the slope-intersection form is given by:

y = mx + b

Where:

m: It is the slope of the line

b: It is the cut-off point with the y axis

We have the following points through which the line passes:

(x_ {1}, y_ {1}): (- 3,2)\\(x_ {2}, y_ {2}) :( 5, -5)

So the slope is:

m = \frac {y_ {2} -y_ {1}} {x_ {2} -x_ {1}} = \frac {-5-2} {5 - (- 3)} = \frac {-7} {5 + 3} = - \frac {7} {8}

Thus, the equation of the line is of the form:

y = - \frac {7} {8} x + b

We substitute one of the points and find "b":

2 = - \frac {7} {8} (- 3) + b\\2 = \frac {21} {8} + b\\b = 2- \frac {21} {8}\\b = \frac {16-21} {8}\\b = - \frac {5} {8}

Finally, the equation is:

y = - \frac {7} {8} x- \frac {5} {8}

Answer:

y = - \frac {7} {8} x- \frac {5} {8}

6 0
3 years ago
1=1/8+x+2/8<br> Pls help and hurry
TEA [102]

Answer:

x = 5/8 plz give branliest

Step-by-step explanation:

Using the equation,1 = \frac{1}{8}  + x + \frac{2}{8}

simplify 1 = x + \frac{3}{8}

1 - \frac{3}{8} = x

\frac{5}{8} = x

6 0
3 years ago
Read 2 more answers
Other questions:
  • Tanya and Reece each walked 4 miles on Monday. Reese also walked 4 miles on Tuesday and 4 miles on Wednesday . How many miles di
    6·1 answer
  • What is greater 0.9 or 95%
    5·1 answer
  • △POQ~△ROS. Identify the coordinates of S and the scale factor. HELP ASAP!!
    13·1 answer
  • Solve the system of equations.
    5·1 answer
  • Question 1&amp;2 with explanation. Pls fast , no useless and nonsense answers pls
    11·1 answer
  • I’m confused on this one
    5·1 answer
  • Susie has $2 in coins in her purse. She has 3 times as many quarters as nickels. She has twice as many dimes as nickels. How man
    13·1 answer
  • Sam invested $7500, some at 7% interest and the rest at 10%. How much did he invest at each rate if he received $570.00 in inter
    8·1 answer
  • HELPPPPPPPPPPP NEEDED PLEASEEEEEEEEEE
    5·1 answer
  • 7 years ago you decided to invest $7,800 into a savings account. When you withdrew the money, you received $8,750. How much mone
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!