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Nostrana [21]
3 years ago
7

Help Please.......Seriously

Mathematics
1 answer:
lutik1710 [3]3 years ago
5 0

Answer:

The answer is C.

Step-by-step explanation:

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a 40 gram sample of a substance that's used for drug research has a k-value of 0.1446. find the substance's half life in days
Novay_Z [31]

The applicable decay formula is:N = No*e^(-kt)WhereN = Mass left after time tNo = Original massk = constantt = half lifeUsing the values given,N/No = e^(-0.1446t) = 1/2ln (1/2) = -0.1446 t *ln e^1-0.6931 = -0.1446 tt = 0.6331/0.1446 = 4.79 daysTherefore, half-life is 4.8 days.

3 0
3 years ago
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Question 2 of 25
tekilochka [14]

Answer: The Answer is C 2.29

Step-by-step explanation: I just got it right on the test

7 0
2 years ago
Trying to finsh fast so help please
max2010maxim [7]

Answer:

A-B

Step-by-step explanation:

5 0
3 years ago
I dont the know the answer to c-d=b for c
Vinvika [58]
C-d=b add to both sides d and will get 

c-d+d=b+d

c=b+d

hope helped 
4 0
3 years ago
PLEASE ANSWER QUICK!!
Citrus2011 [14]

Answer:

A)  B is greater

B) when C = 21, A = 5 and B = 15

C) A must be 0, 5, or 12 for C to be greater than B

Step-by-step explanation:

A)  when a = -3, c = -20 and b = 4(-3)-5 so B = -17

B) when c = 21, a = 5 and b = 4(5)-5 so B = 15

C) C is greater than B when a = 0, 5, and 12

when a = 0, b = 4(0)-5 or -5

when a = 5, b = 4(5)-5 or 15

when a = 12, b = 4(12)-5 or 43

3 0
2 years ago
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