3 years ago

I need help please!!!

Mathematics

1 answer:

gtnhenbr [62]3 years ago

4 0

Answer:

Option D would be the correct answer!

Hope this helps!

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The perimeter of a square is 4/5 what is its area

34kurt

Answer:

1/25

Step-by-step explanation:

square has 4 sides, if you add them all up you get 4/5.

1/5+1/5+1/5+1/5=4/5

so each side is 1/5

Area=length * width

A=1/5*1/5=1/25

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3 years ago

A sample of tritium-3 decayed to 94.5% of its original amount after a year.

Zolol [24]

(a) If $y(t)$ is the mass after $t$ days and $y(0) = A$ then $y(t) = Ae^{kt}.$

$y(1) = Ae^k = 0.945A \implies e^k = 0.945 \implies k = \ln 0.945$

$\text{Then } Ae^{(\ln 0.945)t} = \frac{1}{2}A\ \Leftrightarrow\ \ln e^{(\ln 0.945)t} = \ln \frac{1}{2}\ \Leftrightarrow\ ( \ln 0.945) t = \ln \frac{1}{2} \Leftrightarrow \\ \\
t = - \frac{\ln 5}{\ln 0.945} \approx 12.25 \text{ years}$

(b)
$Ae^{(\ln 0.945) t} = 0.20 A \ \Leftrightarrow\ (\ln 0.945) t \ln \frac{1}{5}\ \implies \\ \\
t = - \frac{\ln 5}{\ln 0.945} \approx 28.45\text{ years}$

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4 years ago

the dot plots how the salaries for the employees at two small companies before a new company head is hired at each company. Sele

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Answer:

I need a picture to solve this.

Step-by-step explanation:

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3 years ago

Which function is equivalent to y = 3(x + 2)2 + 7?

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Answer:

The answer is D

Step-by-step explanation:

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all I know is how to get y but y=122

Step-by-step explanation:

y=3(40)+2

y=120+2

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3 years ago