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3 years ago

What is 28.204 rounded to the nearest whole

Mathematics

2 answers:

SOVA2 [1]3 years ago

8 0

Answer:

Step-by-step explanation:

Ray Of Light [21]3 years ago

5 0

Answer:

Step-by-step explanation:

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A scientist begins with 250 grams of a radioactive substance. After 250 minutes, the sample has decayed to 32 grams. Rounding to

s2008m [1.1K]

Answer:

Part 1 : $A=250 e^{-0.008223t}$

Part 2 : Half life is 84 minutes ( approx )

Step-by-step explanation:

Part 1 : Suppose the function that shows the amount( in grams ) of the substance after t minutes,

$A=A_0 e^{kt}$

If t = 0 min, A = 250 grams,

$250=A_0 e^{0}$

$\implies A_0 = 250$

If t = 250, A = 32 grams,

$32 = A_0 e^{250k}$

$32 = 250 e^{250k}$

$0.128 = e^{250k}$

Taking ln both sides,

$\ln(0.128) = 250k$

$\implies k =\frac{\ln(0.128)}{250}=-0.008223$

Hence, the equation that shows this situation,

$A=250 e^{-0.008223t}$

Part 2 : If A = 250/2 = 125,

$125 = 250 e^{-0.008223t}$

$0.5 = e^{-0.008223t}$

Taking ln both sides,

$\ln(0.5) = -0.008223t$

$\implies t =\frac{\ln(0.5)}{-0.008223}\approx 84$

Therefore, the half life of the substance would be 84 minutes.

8 0

3 years ago

Please help, I need this quickly. It's an easy trigonometric question.

Mashutka [201]

$\bold{ANSWER:}$
OPTION D: None of these

$\bold{EXPLANATIONS:}$

4 0

2 years ago

Read 2 more answers

Express the ratio as a fraction in simplest form 18 oz to 3 cups

valentinak56 [21]

Answer:

6/1

Step-by-step explanation:

Both 18 and 3 can be divided by 3

18 divided by 3 = 6

3 divided by 3 = 1

So the ratio is 6 : 1

So the fraction is 6/1

3 0

3 years ago

Read 2 more answers

HELP PLEASE ASAP!!!!

Akimi4 [234]

Answer:

85°

Step-by-step explanation:

add 125+150=275

a circle is 360

so 275+85=360

4 0

2 years ago

850 tens equals how many thousand

aniked [119]

Well, all you have to do to solve this is multiply 850 times 10, which is 8,500, so that means there are 8 thousands.
PLEASE choose my answer as the Brainliest, as I have explained my answer well, and I am REALLY close to ranking up!
THANK YOU AND I HOPE I HELPED! =D

6 0

3 years ago