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4 years ago

25POINTS!!!

Mathematics

1 answer:

irina [24]4 years ago

5 0

Answer:

10.8 cm

Step-by-step explanation:

Using cosine law

g² = 7.1² + 6.7² - 2(7.1)(6.7)cos(103)

g² = 116.7018433

g = 10.80286274

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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

A dog eats 1/2 of a cup of dog food per meal. how many meals are in a 6-cup bag of dog food

love history [14]

6 / 1/2
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5 0

3 years ago

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denpristay [2]

Answer:

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Step-by-step explanation:

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2 years ago

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If f(x) = 2x^2+ 1 and g(x)= x^2-7, find (f-g)(x)

Ganezh [65]

Answer:

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Step-by-step explanation:

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3 years ago

PLEASE HELP NEED STEP BY STEP EXPLAINATION!!!then ƒ(2) =

andrezito [222]

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3 years ago

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