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SashulF [63]
3 years ago
11

Suppose that it takes John 9 hours to paint a barn if he works alone and it takes Carl 6 hours to paint the same barn if he work

s alone. How long will it take them to paint the barn, in hours, if they work together?
Mathematics
2 answers:
kozerog [31]3 years ago
4 0
.............................3 3/5
Alecsey [184]3 years ago
3 0
<span>If John takes 9 hours to paint a barn, then he does 1/9th of a barn per hour. Similarly, Carl does 1/6th of a barn per hour. Together, they can do 1/9 + 1/6 , or 5/18ths of a barn per hour. Then 1 barn takes 1/(5/18), or 18/5ths hours with the two of them working together</span>
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16 POINTS
Marta_Voda [28]
Solve the following system using elimination:
{7 x + 2 y = -19 | (equation 1)
{2 y - x = 21 | (equation 2)

Add 1/7 × (equation 1) to equation 2:
{7 x + 2 y = -19 | (equation 1)
{0 x+(16 y)/7 = 128/7 | (equation 2)

Multiply equation 2 by 7/16:
{7 x + 2 y = -19 | (equation 1)
{0 x+y = 8 | (equation 2)

Subtract 2 × (equation 2) from equation 1:
{7 x+0 y = -35 | (equation 1)
{0 x+y = 8 | (equation 2)

Divide equation 1 by 7:
{x+0 y = -5 | (equation 1)
{0 x+y = 8 | (equation 2)

Collect results:
Answer: {x = -5, y = 8
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3 years ago
Cuántas diagonales tendría una figura de 8 lados?
Oduvanchick [21]

Answer:      20 diagonales

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
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Sonja [21]

Answer:

C. 9x + 224.36 ≥ 759.84

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 0
3 years ago
K2-4K-21. How do you factor this
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Assuming yo mean
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-7 and 3

(k-7)(k+3) is factored
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