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postnew [5]
2 years ago
10

How much of a radioactive substance must be presented to decay to 80 grams in 12 years if the half-life of the substance is 7.6

years?
Mathematics
2 answers:
elena-s [515]2 years ago
8 0

Answer:

239 grams.

Step-by-step explanation:

Half life t(1/2) = ln 2 / k

So 7.6 = ln 2 / k

k = ln 2 / 7.6 = 0 0901204

N = No e^-kt

So after 12 years

80 = No / e^(-0.0901204*12)

No = 80 / e^(-0.0901204*12)

= 239.

max2010maxim [7]2 years ago
4 0

Answer:

Radioactive in half life is 51gram

Step-by-step explanation:

80grams:12years

X :7.6years

12x÷x=x

7.6×80÷12=51gram

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Please help! Correct answer only, please! I need to finish this assignment this week Consider the matrix shown below: A. B. C. D
Makovka662 [10]

Answer:

Option D is correct

Step-by-step explanation:

The identity matrix is the matrix, in which, the diagonal elements are 1 and all of non-diagonal elements are 0.

Hope this helps!

3 0
3 years ago
4(3+2x) + 2 = 46 , solve for x I need help I'm a bit confused
Reil [10]

Answer:

x=4

Step-by-step explanation:

4(3+2x)+2=46

12+8x+2=46

12+8x=44

8x=32

x=4

8 0
3 years ago
Read 2 more answers
If (82)p = 84, what is the value of p? 2 3 4 6
Brums [2.3K]
Alright, so in order to solve this, we need to isolate the variable. So, we need to simplify the equation. So, we have the equation:
82•P = 84
So, we need to divide both sides by 82 because it is the opposite of multiplication. So, we have :
82•P/82 = 84/82
So, 82•P/82 = 1p = P.
84/82 = P
If You Need Decimal Form, 
84/82 = About 1.02
8 0
3 years ago
DC↔ means “ _____ DC”<br><br> A. line DC<br> B. ray DC<br> C. line segment DC<br> D. angle DC
lidiya [134]
Your answer would be line DC or a have a nice day!
6 0
2 years ago
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Find the indicated limit, if it exists.(7 points)
Alecsey [184]

Answer:

7

Step-by-step explanation:

The left hand limit is when we approach zero from left. We use the function on this domain in finding the limit.

\lim_{x \to 0^-} f(x)=7-x^2

\lim_{x \to 0^-} f(x)=7-(0)^2=7

The right hand limit is

\lim_{x \to 0^+} f(x)=10x+7

\lim_{x \to 0^+} f(x)=10(0)+7=7

Since the left hand limit equals the right hand limit;

\lim_{x \to 0} f(x)=7

7 0
3 years ago
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