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kupik [55]
4 years ago
12

3x+9=5x+21 (Solve for x) Step by Step plz

Mathematics
2 answers:
Morgarella [4.7K]4 years ago
8 0

Answer:

x=-6

Step-by-step explanation:

fomenos4 years ago
5 0

Answer:

X = -6

Step-by-step explanation:

3x+9 = 5x+21

3x-5x=21-9

-2x=12

-X= 12/2

-x=6

Multiply both sides by (-1)

-x*-1 = 6*-1

X = -6

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Answer:the anwser is 4

Step-by-step explanation:

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3 years ago
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Find the circumference of a circle with a diameter of 18 inches
ValentinkaMS [17]

Answer:

39.4384

Step-by-step explanation:

C= 2(pi)(r)

C=2(3.14)(9)

39.4384=2(3.14)(9)

7 0
4 years ago
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X+y=5<br> x×y=6<br> Solve simultaneously with steps
igor_vitrenko [27]

Answer:

(3, 2), (2, 3)

Step-by-step explanation:

x + y = 5

xy = 6

Solve the first equation for x.

x = 5 - y

Substitute 5 - y for x in the second equation.

xy = 6

(5 - y)y = 6

5y - y² = 6

y² - 5y + 6 = 0

Factor.

(y - 2)(y - 3) = 0

y - 2 = 0  or y - 3 = 0

y = 2  or y = 3

Now substitute 2 for y in the first equation and solve for x.

x + y = 5

x + 2 = 5

x = 3

One solution is x = 3; y = 2, or (3, 2).

Now substitute 3 for y in the first equation and solve for x.

x + y = 5

x + 3 = 5

x = 2

Another solution is x = 2; y = 3, or (3, 2).

Answer: (3, 2), (2, 3)

7 0
2 years ago
Exponents!
sweet [91]
We know that:

x^{a+b}=x^a\cdot x^b

and:

(x\cdot y)^a=x^a\cdot y^a

so:

3^{x+2}-3^{x}=6^3\cdot3^7\\\\3^x\cdot3^2-3^x=(2\cdot3)^3\cdot3^7\\\\3^x\cdot9-3^x=2^3\cdot3^3\cdot3^7\\\\3^x\cdot9-3^x=8\cdot3^3\cdot3^7\\\\&#10;3^x\cdot9-3^x=8\cdot3^{3+7}\\\\3^x\cdot9-3^x=8\cdot3^{10}\\\\3^x\cdot(9-1)=8\cdot3^{10}\\\\8\cdot3^x=8\cdot3^{10}\quad|:8\\\\3^x=3^{10}\\\\\boxed{x=10}
4 0
3 years ago
What is the measure of the exterior angle ? <br> 70<br> 180<br> 110
stealth61 [152]

Answer:

110

Step-by-step explanation:

A bump is 180 degrees as well as a triangle. So 90+20=110 and 180-110=70. Meaning 180-70 =110

5 0
4 years ago
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