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lara31 [8.8K]
3 years ago
12

8.1 ÷ 0.9+0.4^3 ÷ 0.8 ⋅ 30

Mathematics
2 answers:
EastWind [94]3 years ago
7 0

Answer:

11.4

Step-by-step explanation:

polet [3.4K]3 years ago
7 0

Answer:

54

Step-by-step explanation:

I think so if it’s wrong

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Perform the indicated operation and express the result as a simplified complex number. I need help with 35
skelet666 [1.2K]

Given:-

\frac{3+4i}{2-i}

To find:-

The simplified form.

At first we take conjucate and multiply below and above.

The conjucate is,

2+i

So now we multiply. we get,

\frac{3+4i}{2-i}\times\frac{2+i}{2+i}

Now we simplify. so we get,

\frac{3+4i}{2-i}\times\frac{2+i}{2+i}=\frac{6+3i+8i+4(i)^2}{2^2-i^2}

We know the value of,

i^2=-1

Substituting the value -1. we get,

\begin{gathered} \frac{6+3i+8i+4(i)^2}{2^2-i^2}=\frac{6+3i+8i+4(-1)_{}^{}}{2^2-(-1)^{}} \\ \text{                               =}\frac{6-4+11i}{2+1} \\ \text{                              =}\frac{2+11i}{3} \end{gathered}

So now we split the term to bring it into the form a+ib. so we get,

\frac{2+11i}{3}=\frac{2}{3}+i\frac{11}{3}

So the required solution is,

\frac{2}{3}+i\frac{11}{3}

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1 year ago
If two or more polygons are congruent, which statement must be true about the polygons? Read all of the choices before deciding.
hodyreva [135]
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Einsteinium-
Natalija [7]

Answer:

                 S(t)=450(2/3)^t

Explanation:

The question is "Einstenium-253 is an element that loses about 2/3 of its mass every month. A sample of einstenium-253 has 450 grams. Write a function that gives the sample's mass in grams, S(t) from today".

Since <em>einstenium-253 loses about 2/3 of its mass every month</em>, you can model the amount of sample by an exponential decay function, which is a geometric progression with a growing factor less than 1.

The general form of an exponential decay function is:

y=A_0r^t

Where:

  • A₀ is the initial value
  • r is the growing or decaying factor
  • t is the time
  • y is the value of the function at time t.

In this case, you have:

  • A₀ = 450
  • r = 2/3
  • t = t
  • y = S(t)

Now you can replace the values in the model and will obtain:

                  S(t)=450(2/3)^t

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Step-by-step explanation:

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