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3 years ago

Resolve into factors: 81a3 + 3b3

Mathematics

1 answer:

iren [92.7K]3 years ago

8 0

Answer: (3a+b)⋅(9a 2 −3ab+b2 )

Step-by-step explanation:

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Plz help..................

Mama L [17]

The answer is 9, 40, 41

5 0

3 years ago

Question 9 of 15 (1 point)

mote1985 [20]

The number is -9

Step-by-step explanation:

Let x be the number then according to given statement

$4x+10 = x-17$

Subtracting 10 from both sides

$4x+10-10 = x-17-10\\4x = x-27$

Subtracting x from both sides

$4x-x = x-x-27\\3x = -27$

Dividing both sides by 3

$\frac{3x}{3} = \frac{-27}{3}\\ x = -9$

Verification:

$4(-9)+10 = -9-17\\-36+10=-26\\-26=-26$

The number is -9

Keywords: Linear equation, variables

Learn more about linear equation at:

#learnwithBrainly

7 0

3 years ago

Nick has an album that holds 700 compact discs. Each page of the album holds 7 compact discs. If 69% of the album is empty, ho

mel-nik [20]

Answer:

Step-by-step explanation:

each page holds 7 discs. the alb holds 700 discs. that means there are 100 pages. 69% of the pages are empty so therefore 41 pages are filled.

4 0

3 years ago

Which two points have a undefined slope

allochka39001 [22]

Answer:

C.(-3, -3) and (-3,3)

Step-by-step explanation:

When we have a vertical line the slope is undefined.

That means the x values stay the same

C.(-3, -3) and (-3,3)

This has the same x values

m = (y2-y1)/(x2-x1)

=( 3- -3)/(-3 - -3)

(3+3)/(-3+3)

6/0

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7 0

3 years ago

Read 2 more answers

Two kilos of taronges and three kilos of mandarins cost 11.50 euros. Three kilos of taronges and two of mandarins cost 11 euros.

Illusion [34]

Answer:

Hence the pricing for each product will be taronges with 2 euros and mandarins with 2.5 euros.

Step-by-step explanation:

Given:

2 kg of taronges and 3 kg mandarins cost 11.5 euros

3kg taronges and 2 kg mandarins cost 11 euros

To Find:

Price for each product

Solution:

Consider 

Taronges =x euros

Mandarins=y euros

So by given condition,

$2x+3y=11.5$ ....................equation(1)

and $3x+2y=11 ...$ ...........equation (2)

So , using substitution method,

$3x=11-2y$

$x=11-2y/3$ .......equation (3)

Using above value in equation(1) we get ,

$2(11-2y)/3+3y=11.5$

$y=(11.5*3-22)/5$ )

y=2.5 euros

Using above value in equation(3) we get ,

$x=(11-2y)/3$

$x=(11-2*2.5)/3$

$x=(11-5)/3$

x=2 euros

5 0

3 years ago