Answer:
20.667
Step-by-step explanation:
Answer:

n ≈ 3
Step-by-step explanation:
9n-2<7+20

Answer:
1.First Move the decimal point in the divisor and dividend.
2.Place a decimal point in the quotient (the answer) directly above where the decimal point now appears in the dividend.
3.Divide as usual, being careful to line up the quotient properly so that the decimal point falls into place.
Step-by-step explanation:
I got it from google tbh
Answer:
(-26, 32)
Step-by-step explanation:
Answer:
The half-life of the radioactive substance is 135.9 hours.
Step-by-step explanation:
The rate of decay is proportional to the amount of the substance present at time t
This means that the amount of the substance can be modeled by the following differential equation:

Which has the following solution:

In which Q(t) is the amount after t hours, Q(0) is the initial amount and r is the decay rate.
After 6 hours the mass had decreased by 3%.
This means that
. We use this to find r.







So

Determine the half-life of the radioactive substance.
This is t for which Q(t) = 0.5Q(0). So







The half-life of the radioactive substance is 135.9 hours.