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Murrr4er [49]
2 years ago
11

Solve 5-2x > 4, then represent on a number line​

Mathematics
1 answer:
Varvara68 [4.7K]2 years ago
7 0

Answer:  x < 1/2 or x < 0.5

The graph is below

=========================================================

There are two ways to solve this

Method 1

5 - 2x > 4

-2x > 4-5

-2x > -1

x < -1/(-2) .... note the inequality sign flips

x < 1/2

x < 0.5

The inequality sign flips whenever we divide both sides by a negative number.

----------------------

Method 2

5 - 2x > 4

5 - 2x+2x > 4+2x

5 > 4+2x

4+2x < 5

2x < 5-4

2x < 1

x < 1/2

x < 0.5

----------------------

To graph this on a number line, we'll plot an open hole at 1/2 or 0.5 on the number line. Then we shade to the left to represent all values smaller than 1/2 = 0.5

The open hole signals that 0.5 itself is NOT part of the solution set.

See the diagram below.

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A scientist needs 4.8 liters of a 12% alcohol solution. She has available a 22% and a 10% solution. How many liters of the 22% a
yanalaym [24]

Answer:

  • 4.0 L of 10%
  • 0.8 L of 22%

Step-by-step explanation:

For mixture problems, it is convenient to define a variable to represent the amount of the greatest contributor. Let x represent the amount of 22% solution in the mix. Then 4.8-x is the amount of 10% solution.

The amount of alcohol in the mix is ...

  0.22x +0.10(4.8-x) = 0.12(4.8)

Eliminating parentheses, we have ...

  0.22x -0.10x +0.10(4.8) = 0.12(4.8)

Subtracting (0.10)(4.8) and combining x-terms gives ...

  0.12x = 0.02(4.8)

  x = (0.02/0.12)(4.8) = 0.8 . . . . . divide by the x-coefficient

The scientist needs 0.8 L of 22% solution and 4.0 L of 10% solution.

5 0
3 years ago
DOES ANYONE KNOW THE ANSWER PLEASE HELP
lorasvet [3.4K]

Answer:

It should be 4 or (0,4)

Step-by-step explanation:

The y-intercept is just where one of the lines of the graph crosses the y-axis, which in the picture shows it crosses at (0,4)

3 0
3 years ago
Just need the answers to see if im right lol
denis-greek [22]

Answer:

what is the question ? Volume or surface area???

6 0
3 years ago
Nine hundred and fifty seven divided by one hundred
Kryger [21]

Answer:

9.57

Step-by-step explanation:

900 / 100 is 9 but then you just have to add the 57 with a decimal at the end

5 0
2 years ago
**PLEASE HELP**
zepelin [54]
----------------------------------------------------------
Given information
----------------------------------------------------------
Area = 3x² + 14x + 8 
Length = x + 4

----------------------------------------------------------
Formula
----------------------------------------------------------
Area = Length x Width

----------------------------------------------------------
Find Width
----------------------------------------------------------
3x² + 14x + 8  = (x + 4) x width
width = (3x² + 14x + 8) ÷ (x + 4)
width =  (x+4)(3x+2) ÷ (x + 4)
width = 3x + 2

----------------------------------------------------------
Answer: The width is 3x + 2 (Answer C)
----------------------------------------------------------
5 0
3 years ago
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