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inn [45]
3 years ago
14

PLEASEEEEEW ANSWERRRRRRRRR QUICKKKKKMM

Mathematics
1 answer:
pychu [463]3 years ago
4 0

Answer:

multiply all the numbers

Step-by-step explanation:

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The boat sailed 30min upstream and sailed 60km, and returned the same distance downstream (60km) and sailed it in 20min. Find th
elena55 [62]

Answer:

Step-by-step explanation:

b and c are the speeds of the boat and current, respectively.

Traveling upstream, the boat moves b-c km per hour.

Traveling downstream, the boat moves b+c km per hour.

b-c = (60 km)/(½ h) = (120 km)/h

b+c = (60 km)/(⅓ h) = (180 km)/h

Adding the equations together,

2b = (300 km)/h

b = (150 km)/h

c = (30 km)/h

7 0
3 years ago
4/w - 10 = 5<br>this is 8th grade<br>​
vovikov84 [41]

Answer:

4/w-10=5

One solution was found :

                  w = 4/15 = 0.267

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    4/w-10-(5)=0

Step by step solution :

Step  1  :

           4

Simplify   —

           w

Equation at the end of step  1  :

  4          

 (— -  10) -  5  = 0

  w          

Step  2  :

Rewriting the whole as an Equivalent Fraction :

2.1   Subtracting a whole from a fraction

Rewrite the whole as a fraction using  w  as the denominator :

         10     10 • w

   10 =  ——  =  ——————

         1        w  

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

2.2       Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

4 - (10 • w)     4 - 10w

————————————  =  ———————

     w              w  

Equation at the end of step  2  :

 (4 - 10w)    

 ————————— -  5  = 0

     w        

Step  3  :

Rewriting the whole as an Equivalent Fraction :

3.1   Subtracting a whole from a fraction

Rewrite the whole as a fraction using  w  as the denominator :

        5     5 • w

   5 =  —  =  —————

        1       w  

Step  4  :

Pulling out like terms :

4.1     Pull out like factors :

  4 - 10w  =   -2 • (5w - 2)

Adding fractions that have a common denominator :

4.2       Adding up the two equivalent fractions

-2 • (5w-2) - (5 • w)     4 - 15w

—————————————————————  =  ———————

          w                  w  

Equation at the end of step  4  :

 4 - 15w

 ———————  = 0

    w  

Step  5  :

When a fraction equals zero :

5.1    When a fraction equals zero ...

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Here's how:

 4-15w

 ————— • w = 0 • w

   w  

Now, on the left hand side, the  w  cancels out the denominator, while, on the right hand side, zero times anything is still zero.

The equation now takes the shape :

  4-15w  = 0

Solving a Single Variable Equation :

5.2      Solve  :    -15w+4 = 0

Subtract  4  from both sides of the equation :

                     -15w = -4

Multiply both sides of the equation by (-1) :  15w = 4

Divide both sides of the equation by 15:

                    w = 4/15 = 0.267

One solution was found :

                  w = 4/15 = 0.267

Step-by-step explanation:

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3 years ago
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The is gonna be 2.72 because its subtraction an it you where to subtract 8.7 from 11.42 the answer would be 2.72


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4 years ago
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Sav [38]

Answer:

w = 167/2

This might be wrong

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3 years ago
Cole had 3/4 hour of free time before dinner. He spent 2/3 of the time playing guitar. How long did he spend playing guitar? Ple
Kryger [21]
He spent 30 minutes playing the guitar
6 0
3 years ago
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