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3 years ago

Need help real fast.

Mathematics

1 answer:

ira [324]3 years ago

7 0

Answer:

option 4

Step-by-step explanation:

using the equation stated above

1st term = -6+(1-1=0)*(6)=-6

4th term= -6+(4-1=3)*6=12

10th term= -6+(10-1=9)*6=48

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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

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3 years ago

There 30 giraffes and 6 penguins at the zoo which satement correctly compares the to quanties

dsp73

Answer:

It's A big man

Step-by-step explanation:

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2 years ago

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100 BRAINLY POINTS!!!

laila [671]

Answer:

C. Her sister grew about 0.75 inch each month.

Step-by-step explanation:

Given function:

y = 0.75x + 15

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y - current heigt of baby
x - number of months passed
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According the above explanation the correct answer choice is C

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2 years ago

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The price of gold is often reported per ounce. At the end of 2005, this price was $513. At the end of 2015, it was $1060. By wha

GuDViN [60]

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2 years ago

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Yanka [14]

Answer:

3 divided by 4 is 0.75

Step-by-step explanation:

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2 years ago

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