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
Pachacha [2.7K]
1 year ago
11

1.Arsenic-74 is used to locate brain tumors. It has a half-life of 17.5 days. 90 mg wereused in a procedure. Write an equation t

hat can be used to determine how much ofthe isotope is left after x number of half-lives.2. how much would be left after 70 days ?
Mathematics
1 answer:
Sophie [7]1 year ago
4 0

1)\text{   }N_t\text{ = 90\lparen}\frac{1}{2})^{\frac{t}{17.5}}

2) 5.625 mg will be left

Explanation:

1) Half-life = 17.5 days

initial amount of Arsenic-74 = 90 mg

To get the equation, we will use the equation of half-life:

\begin{gathered} N_t\text{ = N}_0(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}} \\ where\text{ N}_t\text{ = amount remaining} \\ N_0\text{ = initial amount} \\ t_{\frac{1}{2}\text{ }}\text{ = half-life} \end{gathered}N_t\text{ = 90\lparen}\frac{1}{2})^{\frac{t}{17.5}}

2) we need to find the remaining amount of Arsenic-74 after 70 days

t = 70

\begin{gathered} N_t=\text{ 90\lparen}\frac{1}{2})^{\frac{70}{17.5}} \\ N_t\text{ = 5.625 mg} \end{gathered}

So after 70 days, 5.625 mg will be left

You might be interested in
20-10 write four equivalent expressions
igor_vitrenko [27]
Here's two. I can't think of any more.


20/10
20-(-10)
5 0
3 years ago
Please help I don't get number five and please explain
marysya [2.9K]
The answer is 11 becauze the pattern works like this - 18÷2=9 20÷2=10 22÷2=11 Basically the X axis being divided by 2 which equals the Y axis (eg: X÷2=Y
3 0
3 years ago
Price ($)87654321Price of CupsFind the unit rate ofthe price per cup.$[?]$54 cups 1 cup=Give your answer asa decimal.
Yanka [14]

Solution

Given the question in the image, the following are the solution steps to answer the question.

STEP 1: Write the formula for slope

m=\frac{y_2-y_1}{x_2-x_1}

STEP 2: Pick two points

STEP 3: Find the unit price per cup

Since 4 cups cost $5, one cup will cost

\frac{5}{4}=\text{ \$}1.25\text{ per cup}

Therefore, the answer is $1.25

8 0
1 year ago
Find the absolute value and the opposite of the integer.
Talja [164]
The absolute value is always non-negative!

So the absolute value of 57 is 57 itself, as it's non-negative (i.e. it's positive or 0).

Opposite value is the number with a different sign: an opposite value of a positive number is negative, so here it will be -57 .

The correct answer is C. 

7 0
3 years ago
Read 2 more answers
Find the area of the trapezoid answers 30 , 60 , 90 , 120
olga nikolaevna [1]
There is no picture to be solved
4 0
3 years ago
Other questions:
  • An arrangement of marbles has 12 marbles in the first row and 10 rows in all. In each successive row one marble is added.What is
    10·2 answers
  • A triangle has an area of 288.6 square kilometers and a height of 26 kilometers. What is the length of the base?
    6·1 answer
  • Does a negative divided by a negative equal a positive
    15·2 answers
  • Can someone help me plesssss
    7·2 answers
  • 7. Solve for x, showing each of the steps.<br> (MAFS.8.EE.3.7)<br> x + 5 = -10<br> WIN
    15·1 answer
  • How many 1/16 pieces are in 2/8
    10·1 answer
  • A fence is 692 m long. It is cut into three parts. Two parts are the same length, and the third part is 26 m longer than either
    8·1 answer
  • Find the values of a, b and c
    13·1 answer
  • Help to find the answer!
    7·2 answers
  • Please help if you can!!!!
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!