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3 years ago

Construct x such that a/x= x/b

Mathematics

1 answer:

jenyasd209 [6]3 years ago

8 0

$\frac{a}{x} = \frac{x}{b}$

From there we can see that because x equals both to a and b, it must be that a = b.

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The system of equations 3x + 9y^3= -21, 13y^3+4x=-1 has exactly one solution.

drek231 [11]

Answer:

$\huge\boxed{(-88,3)}$

Step-by-step explanation:

$\sf 3x + 9y^3 = -21$ -------------------------- (1)

$\sf 13y^3+4x= -1$ -------------------------- (2)

Multiply Eq. (1) by 13 and (2) by 9

Equation (1):

$\sf 13(3x+9y^3) = -21 * 13$

$\sf 39x + 117y^3=-273$ --------------------(3)

Equation (2):

$\sf 9(13y^3+4x) = -1* 9$

$\sf 117y^3 + 36x = -9$ ------------------------(4)

Subtract Eq. (2) from (1)

$\sf 39x+117y^3-117y^3 -36x=-273+9$

39x - 36x = -264

3x = -264

Dividing both sides by 3

x = -88

$\rule[225]{225}{2}$

Put x = -88 in Eq. (1)

3(-88)+9y³ = -21

-264 + 9y³ = -21

9y³ = -21 + 264

9y³ = 243

Dividing both sides by 9

y³ = 27

Taking cube root on both sides

y = 3

$\rule[225]{225}{2}$

Ordered Pair = (x,y) = (-88,3)

$\rule[225]{225}{2}$

Hope this helped!

<h3>~AnonymousHelper1807</h3>

8 0

3 years ago

Plz help me with all of this question here and explain how was the incorrect answer obtained

larisa [96]

Answer:

1.) 9

2.) 20

Step-by-step explanation:

1.) 39 is incorrect because they didn't follow the PEMDAS rule.

They subtracted 2 from 15 which is 13, and then they multiplied 13 by 3.

The correct way is to multiply 2 times 3 which is 6, and then subtract 6 from 15 which is 9.

2.) 12 is incorrect because they didn't use PEMDAS.

They added 8 to 16 which is 24, and then divided 24 by 2.

The correct way is to divide 8 by 2 which is 4, and then add for to 16 which 20.

4 0

3 years ago

I ACTUALLY REALLY NEED A ANSWER FOR THIS SO IF YOU DONT ACTUALLY NO PLEASE DO NOT ANSWER!!!!

MrMuchimi

Answer:

The surface area is 10.26 feet.

Step-by-step explanation:

A=lw+l(w

2)2+h2+w(l

2)2+h2=0.8·0.8+0.8·(0.8

2)2+62+0.8·(0.8

2)2+62≈10.26131

3 0

3 years ago

Complete the solution of the equation. Find the

weeeeeb [17]

Answer: " y = -10 . "

___________________

Step-by-step explanation:

___________________

The question:

Find the value of "y" when "x" equals 17.

Given the equation:

- x + y = -27 ;

___________________

We plug in the given value: "17" ; for "x" ; and solve for "y" :

- 17 + y = -27 ;

_____________________

↔ y + (-17) = -27 ;

Rewrite as:

y − 17 = -27 ; {since: "adding a negative value" is the same

as "subtracting a positive value."}.

_____________________

Now, we add "17" to each side of the equation;

to isolate "y" on one side of the equation; and to solve for "y" :

y − 17 + 17 = -27 + 17 ;

to get:

y = - 10 .

_____________________

Hope this is helpful to you.

Best wishes to you in your academic pursuits—

and within the "Brainly" community!

_____________________

7 0

3 years ago

Read 2 more answers

A cabinet door has a perimeter of 62 inches its area is 228 in.² what are the dimensions of the door

Vlad1618 [11]

P=2(L+W)
A=LW

given
P=62
62=2(L+W)
divide 2
31=L+W
minus W
L=31-W

sub into other one
A=LW
A=(31-W)(W)
228=31W-W^2
times -1
W^2-31W=-228
add 228 both sides
W^2-31W+228=0
factor
what 2 numbers multiply to get 228 and add to get -31
-19 and -12
(W-19)(W-12)=0
set to zero

W-19=0
W=19

W-12=0
W=12

sub back

L=31-W
L=31-12
L=19
or
L=31-19
L=12

the doorway is 12in by 19in

4 0

3 years ago