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Mice21 [21]
3 years ago
7

Please help explanation if possible

Mathematics
2 answers:
Debora [2.8K]3 years ago
8 0

Answer:

x = 71 and y = 19

Step-by-step explanation:

Given the 2 equations

x + y = 90 → (1)

x = 14 + 3y → (2)

Substitute x = 14 + 3y into (1)

14 + 3y + y = 90 ( subtract 14 from both sides )

4y = 76 ( divide both sides by 4 )

y = 19

Substitute y = 19 into (1) for value of x

x + 19 = 90 ( subtract 19 from both sides )

x = 71

Larger number x = 71 ; Smaller number y = 19

fgiga [73]3 years ago
3 0

that's the answer pls mark as brainliest

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Solve the proportion using cross product round to the nearest hundredth if necessary 21/49 = 15/h
bekas [8.4K]
The answer is a) 35 because if you set 21/49 and 15/h equal to eachother and cross multiply it should lead you to 21(h) = 15(49) which then equals 21h = 735 and if you divide 21 on both sides you should get h = 35
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4 years ago
Hunter and his workout partner arelifting weights together, doing manysets of each exercise. On a certainexercise, Hunter is usi
Soloha48 [4]

9514 1404 393

Answer:

  • 1 set completed
  • 21 kg

Step-by-step explanation:

The difference in mass of the bars is 19-15 = 4 kg. The difference in mass of the added weight is 6-2 = 4 kg. The difference in total mass (bar +added) is reduced by the difference in added mass after each set. The number of sets required to reduce the difference to zero is ...

  (4 kg)/(4 kg/set) = 1 set

After 1 set, Hunter will increase the mass to 19 kg + 2 kg = 21 kg.

After 1 set, his partner will increase the mass to 15 kg +6 kg = 21 kg.

Both will be lifting 21 kg for their 2nd set, after they have completed 1 set.

_____

<em>Additional comment</em>

You can write equations for the mass being lifted by Hunter (h) and his partner (p) after s sets:

  h = 19 +2s

  p = 15 +6s

The masses will be equal when ...

  h = p

  19 +2s = 15 +6s

  19 = 15 +4s . . . . . . . subtract 2s

  4 = 4s . . . . . . . . . . . subtract 15

Note that the number on the left side of the equation is 19-15, the difference of bar masses. The coefficient on the right side is 6-2, the difference in the added masses. To find the number of sets (s), we divide the equation by the coefficient of s:

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In the above solution we skipped directly to this final division in order to find the number of sets until the lifted masses were equal.

5 0
3 years ago
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In a left triangle DEF
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Which of the following is the solution to the inequality below?
irakobra [83]

Answer:1/3

Step-by-step explanation:

Rearrange the equation by subtracting what is to the right of the greater than sign from both sides of the inequality :

                    3/2*(x-1/3)-(-5*x)>0  

Step by step solution :

STEP

1

:

           1

Simplify   —

           3

Equation at the end of step

1

:

  3         1      

 (— • (x -  —)) -  -5x  > 0  

  2         3      

STEP

2

:

Rewriting the whole as an Equivalent Fraction

2.1   Subtracting a fraction from a whole

Rewrite the whole as a fraction using  3  as the denominator :

         x     x • 3

    x =  —  =  —————

         1       3  

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:

x • 3 - (1)     3x - 1

———————————  =  ——————

     3            3    

Equation at the end of step

2

:

  3   (3x - 1)      

 (— • ————————) -  -5x  > 0  

  2      3          

STEP

3

:

           3

Simplify   —

           2

Equation at the end of step

3

:

  3   (3x - 1)      

 (— • ————————) -  -5x  > 0  

  2      3          

STEP

4

:

Equation at the end of step

4

:

 (3x - 1)    

 ———————— -  -5x  > 0  

    2        

STEP

5

:

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5.1   Subtracting a whole from a fraction

Rewrite the whole as a fraction using  2  as the denominator :

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Adding fractions that have a common denominator :

5.2       Adding up the two equivalent fractions

(3x-1) - (-5x • 2)     13x - 1

——————————————————  =  ———————

        2                 2    

The equation at the end of step

5

:

 13x - 1

 ———————  > 0  

    2    

STEP

6

:

6.1    Multiply both sides by  2  

6.2    Divide both sides by  13  

     x-(1/13)  > 0

Solve Basic Inequality :

6.3      Add  1/13  to both sides

            x > 1/13

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3 years ago
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The answer is:
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