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Allisa [31]
3 years ago
9

Eveloped By An Engine With A Displacement Of 220 Cu In. If A 360 Cu In. Engine Of The Same Kind Develops 210 Hp? This problem ha

s been solved! See the answer hoserpower developed by an engine varies directly as its displacement. How many horsepower will be developed by an engine with a displacement of 220 cu in. If a 390cu in. Engine of the same kind develops 230hp?
Mathematics
1 answer:
exis [7]3 years ago
5 0

Answer:

  about 130 hp

Step-by-step explanation:

The displacement is smaller by a factor of 220/390, so we expect the horsepower to be smaller than 230 hp by the same factor:

  (220/390)(230 hp) ≈ 129.74 hp ≈ 130 hp

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3 years ago
Find the common fraction equivalent to 0.12
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The answer is:  " \frac{4}{33} "  .
______________________________
Given:  0.1212121212..... repeating ;  write that value as a fraction;
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In other words; we are given:  "0.1212121212..... repeating infinitely" ;  

→ that is to say; "0.12 ...  ;  {the "12" decimal portion repeats infinitely} ; 
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→ We write this value, as a fraction, as:  "12/99" ;
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→Explanation:
__________________________________________ 


Note:  "0.99999999...... repeating infinitely;  =  "1" .
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→Since:

Let us say that we have: 

"x = 0.999999 ; repeating infinitely;  

In order words, let us say we have: "x = 0.9.... ;  the "9" decimal repeats infinitely; 
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   Then "10x" ;  (that is: "10" multlipled by "x";  or "10*x" or "10x" );  is equal to:

"10" * (0.999999.....)  = 9.99999999...... (the "9" decimal repeats infinitely);

in other words:  10x = 9.99999999....

Divide each side by "10" ;

to get "x = 0.9999999....." ; the decimal "9" repeats indefinitely...." ;

But if you have:  "10x = 10" ;  divide each side of the equation by "10" ; 
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Also,  if "x = 0.9999...(repeating infinitely); 

then:  10x = 9.99999.
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           10x  =  9.999999999999999......
       −     x  =  0.999999999999999.......
    _____________________________________
            9x  =  9.00000000000000000000.....

 →  9x = 9 ; 

Divide each side of the equation; to get; 

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So, if the numbers "12" is repeating, we divie "12" by "99" ; 
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________________________________________
            So;  0.12121212.....(the "12" is the decimal that repeats infinitely);            
                   
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Divide each side (both the numerator AND the denominator); by "3" ;
_________________________________________
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The answer is:  \frac{4}{33}  .
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Answer:

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Step-by-step explanation:

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