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By adding all the parts seperately and adding them together.

This question is very poorly phrased and the meaning is not clear.    

Translating from Romanian

dividing the sum of three consecutive natural numbers 7, 12 and the rest get Sin5

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This translation does not make sense, sorry.

Try phrasing it differently and check that all your words are spelt correctly. 

Încercați frazare mod diferit și verificați dacă toate cuvintele sunt scrise corect.

That is a cool diagram Alan 

D.

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$${\mathtt{50}} = {\frac{{\mathtt{131.4}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{3}}\right)}{{\mathtt{d}}}}$$

$${\mathtt{50}}{\mathtt{\,\times\,}}{\mathtt{d}} = {\mathtt{131.4}}{\mathtt{\,\times\,}}{\mathtt{log3}}$$         =>        $${\mathtt{d}} = {\frac{{\mathtt{131.4}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{3}}\right)}{{\mathtt{50}}}}$$

  d =   $${\frac{{\mathtt{131.4}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{3}}\right)}{{\mathtt{50}}}} = {\mathtt{1.253\: \!874\: \!657\: \!403\: \!272\: \!9}}$$

$${\frac{{\mathtt{4\,048}}}{{\mathtt{367}}}} = {\mathtt{11.029\: \!972\: \!752\: \!043\: \!596\: \!7}}$$

$${\frac{{\mathtt{4\,048}}}{{\mathtt{367}}}} = {\mathtt{11}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{11}}}{{\mathtt{367}}}}$$

$${\mathtt{0.029\: \!972\: \!752}} = {\frac{{\mathtt{11}}}{{\mathtt{367}}}}$$

$${\mathtt{11}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{11}}}{{\mathtt{367}}}} = {\frac{{\mathtt{4\,048}}}{{\mathtt{367}}}} = {\mathtt{11.029\: \!972\: \!752\: \!043\: \!596\: \!7}}$$

If they paid 45.70 after the 20% discount the original cost must have been 45.70/0.8.  The discount was therefore 0.2*45.70/0.8 = 45.70/4

$${\mathtt{discount}} = {\frac{{\mathtt{45.7}}}{{\mathtt{4}}}} \Rightarrow {\mathtt{discount}} = {\mathtt{11.425}}$$

discount = 11.43 

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$${\frac{{\mathtt{364.79}}}{{\mathtt{2}}}} = {\mathtt{182.395}}$$

Notice that the height is twice the radius (or height is the same as the diameter).

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Rearrange as (1-1.5)*30000/15 = 1 - 1.5ⁿ

Then  1.5ⁿ = 1 - (1-1.5)*30000/15

Take logs of both sides and use log(a^b) = b*log(a)

n*log(1.5) = log(1 - (1-1.5)*30000/15)

Divide both sides by log(1.5)

$${\mathtt{n}} = {\frac{{log}_{10}\left({\mathtt{1}}{\mathtt{\,-\,}}{\frac{\left({\mathtt{1}}{\mathtt{\,-\,}}{\mathtt{1.5}}\right){\mathtt{\,\times\,}}{\mathtt{30\,000}}}{{\mathtt{15}}}}\right)}{{log}_{10}\left({\mathtt{1.5}}\right)}} \Rightarrow {\mathtt{n}} = {\mathtt{17.039\: \!085\: \!832\: \!934\: \!851}}$$

n ≈ 17

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This calculates the volume of a cone.

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If you take the density of water to be 1000 kg/m³, then 400 g is 0.4/1000 = 4*10^-4 m³ 

1 m³ = 10³ litres so 400 g of water occupy a volume of 4*10^-4*10³ litres = 0.4 litres. 

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Depends which definition of "cup" you use.

The US "legal" cup is 240 ml, so 1080ml is 1080/240 = 4.5 cups.

The US "customary" cup is 236.5882365 ml so 1080 ml is 1080/236.5882365 = 4.56489... cups

The "metric" cup is 250 ml so 1080 ml is 1080/250 = 4.32 cups.

Take your pick!

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22(a-20)=198     distribute the 22 across both terms in the parentheses

22a - 440 = 198     add 198  to both sides

22a = 638      divide both sides by 22

a = 29

f(3)  = 3 - √[3 - 2]  =  3 - √1  = 3 - 1 = 2

Woops, I totally made a typo. Its supposed to be 

a. find f(11), f(6), f(3), f(2), and f(0).

Does that change anything from f(3) on?

and what should f(3) be?

Also, I forgot to add one last question. 

e. Set f(x)=f and solve for x. Show on your graph that one solution is valid and the other one is extraneous. (Plot 2 points showing one is on the graph and the other is not.)

f(6)  = 6 - √[6 - 2]  =  6 - √4  = 6 - 2 = 4

f(2) = 6 - √[2 - 2] = 6  - 0 = 6

f(0) = not defined

I don't understand  ...  f(x)  = f       what is "f"  (???)

what's missing, CPhill?? Thanks for helping btw :)

CPhill, that is so sweet:) I had no idea you had a sweetheart on here. <3

log₄2+log₄32    By a log property we can write

log₄ [2 * 32]   =  log₄ [64]  = log₄ 4^3  = 3 log₄ 4  = 3(1) = 3