All categories

3 years ago

Of the

Mathematics

2 answers:

k0ka [10]3 years ago

7 0

Answer:

add a peireiod

Step-by-step explanation:

kirill [66]3 years ago

7 0

Answer:

287

Step-by-step explanation:

You might be interested in

I WILL GIVE BRAINLIEST! Parallelogram WXYZ has vertices W(-5, 3), X(-2, 0), Y(-4, -2), and Z(-7, 1), as shown in the graph below

Blizzard [7]

Answer:

Step-by-step explanation:

3 0

3 years ago

What is the solution to 3!

AlekseyPX

3! =3 x 2 x 1 = 6

Y!= Y x (y-1) x ... x 1=

4 0

3 years ago

Read 2 more answers

Find the measure of an angle that is four hundred eighty-five less than four times its supplement.

Ludmilka [50]

Is 121.25 because 485 divided by 4 is 121.25

4 0

3 years ago

Initially 100 milligrams of a radioactive substance was present. After 6 hours the mass had decreased by 3%. If the rate of deca

Hitman42 [59]

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:

$\frac{dQ}{dt} = -rt$

Which has the following solution:

$Q(t) = Q(0)e^{-rt}$

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 $Q(6) = (1-0.03)Q(0) = 0.97Q(0)$ . We use this to find r.

$Q(t) = Q(0)e^{-rt}$

$0.97Q(0) = Q(0)e^{-6r}$

$e^{-6r} = 0.97$

$\ln{e^{-6r}} = \ln{0.97}$

$-6r = \ln{0.97}$

$r = -\frac{\ln{0.97}}{6}$

$r = 0.0051$

$Q(t) = Q(0)e^{-0.0051t}$

Determine the half-life of the radioactive substance.

This is t for which Q(t) = 0.5Q(0). So

$Q(t) = Q(0)e^{-0.0051t}$

$0.5Q(0) = Q(0)e^{-0.0051t}$

$e^{-0.0051t} = 0.5$

$\ln{e^{-0.0051t}} = \ln{0.5}$

$-0.0051t = \ln{0.5}$

$t = -\frac{\ln{0.5}}{0.0051}$

$t = 135.9$

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

6 0

3 years ago

How do you multiply decimals

Alchen [17]

Answer:

multiply them like you normally would and add up the decimal places, then place ur decimal.

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers