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3 years ago

It takes 36 minutes for 7 people to paint 5 walls. How many minutes does it take for 9 people to paint 7 walls

Mathematics

1 answer:

Anit [1.1K]3 years ago

5 0

Answer:

About 46.26 minutes.

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The equation of a line is 4x−3y=−24.<br><br> What is the x-intercept of the line?

jasenka [17]

-6,0
i hope this helps and the y intercept is
0,8

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3 years ago

Y=x-4 and -4x-6y=-16

denis-greek [22]

Answer:

x=4

y=0

Step-by-step explanation:

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3 years ago

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I need help in problem 8 plz help me I need a a

iogann1982 [59]

Here are three ways where There could be equal rows

3*12=36
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3 years ago

Which of the following expressions is equivalent to a3 + b3?

lubasha [3.4K]

ANSWER
${a}^{3} + {b}^{3} = (a + b)( {a}^{2 } - ab + {b}^{2} )$

EXPLANATION

To find the expression that is equivalent to
${a}^{3} + {b}^{3}$
we must first expand
${(a + b)}^{3}$
Then we rearrange to find the required expression.

So let's get started.

${(a + b)}^{3} = (a + b) {(a + b)}^{2}$

We expand the parenthesis on the right hand side to get,

${(a + b)}^{3} = (a + b) ( {a}^{2} + 2ab + {b}^{2} )$

We expand again to obtain,

${(a + b)}^{3} = {a}^{3} + 3 {a}^{2}b + 3a {b}^{2} + {b}^{3}$

Let us group the cubed terms on the right hand side to get,

${(a + b)}^{3} = {a}^{3} + {b}^{3} + 3 {a}^{2}b + 3a {b}^{2}$

${(a + b)}^{3} = {a}^{3} + {b}^{3} + 3ab (a+ b)$

We make the cubed terms the subject,

${(a + b)}^{3} - 3ab (a+ b) = {a}^{3} + {b}^{3}$

We factor to get,

$(a + b)({(a + b)}^{2} - 3ab ) = {a}^{3} + {b}^{3}$

We expand the bracket on the left hand side to get,

$(a + b)( {a}^{2} + 2ab + {b}^{2} - 3ab ) = {a}^{3} + {b}^{3}$

We finally simplify to get,

$(a + b)( {a}^{2} - ab + {b}^{2} ) = {a}^{3} + {b}^{3}$

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3 years ago

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How do you do this equation? <br> 6- 4x less than or equal to 34

Alex73 [517]

X would be less than 6 2/3.

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3 years ago

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