Round 55,964 to the nearest 1,000.

Mathematics

2 answers:

Novosadov [1.4K]3 years ago

4 0

Answer: 56,000

Step-by-step explanation: since the number is 55,964 the 964 would cause the number, rounded to the thousandths, to be 56,000.

stellarik [79]3 years ago

4 0

Answer:

56,000 because 55,964 is close to 56,000 than 55,000

Step-by-step explanation:

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Half-life of Po-210 is 140 days. If the initial mass of the sample is 5

Anna35 [415]

Answer:

$0.625kg$

Step-by-step explanation:

we are given half-life of PO-210 and the initial mass

we want to figure out the remaining mass after 420 days

in order to solve so we can consider the half-life formula given by

$\displaystyle f(t) = a {0.5}^{t/T}$

where:

f(t) is the remaining quantity of a substance after time t has elapsed.
a is the initial quantity of this substance.
T is the half-life

since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5

thus substitute:

$\displaystyle f(420)=5\cdot{0.5}^{420/140}$

reduce fraction:

$\displaystyle f(420)=5\cdot{0.5}^{3}$

By using calculator we acquire:

$\displaystyle f(420)=0.625$

hence, the remaining sample after 420 days is 0.625 kg

4 0

3 years ago

I don't understand this question very well

shepuryov [24]

There are 10 marbles in the bag all together.
(8/10) = 80% of the marbles in the bag are white.

So if you pull a marble out of the bag, you have an 80% chance
of pulling a white one.

And if you do it many times, you expect that you'll pull
a white one out about 80% of the times.

80% pf 45 times = 0.8 x 45 = 36 times .

8 0

3 years ago

Solve for x.

olga nikolaevna [1]

Answer:

$\boxed{x=5},x=-9$