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Stels [109]
3 years ago
8

Which is the correct answer ? 11 points.

Mathematics
1 answer:
Westkost [7]3 years ago
5 0

<em><u>Answer:</u></em>

<em><u>O</u></em><em><u>P</u></em><em><u>T</u></em><em><u>I</u></em><em><u>O</u></em><em><u>N</u></em><em><u> </u></em><em><u>B</u></em><em><u> </u></em><em><u>I</u></em><em><u>S</u></em><em><u> </u></em><em><u>R</u></em><em><u>I</u></em><em><u>G</u></em><em><u>H</u></em><em><u>T</u></em><em><u>.</u></em>

<em><u>7j+14k=28</u></em><em><u> </u></em><em><u> </u></em><em><u>A</u></em><em><u>N</u></em><em><u>D</u></em><em><u> </u></em><em><u>J</u></em><em><u>=</u></em><em><u>2</u></em>

<em><u>T</u></em><em><u>H</u></em><em><u>E</u></em><em><u>R</u></em><em><u>E</u></em><em><u>F</u></em><em><u>O</u></em><em><u>R</u></em><em><u>E</u></em><em><u>,</u></em><em><u>7</u></em><em><u>*</u></em><em><u>2</u></em><em><u>+</u></em><em><u>1</u></em><em><u>4</u></em><em><u>K</u></em><em><u>=</u></em><em><u>2</u></em><em><u>8</u></em>

<em><u>1</u></em><em><u>4</u></em><em><u>+</u></em><em><u>1</u></em><em><u>4</u></em><em><u>K</u></em><em><u>=</u></em><em><u>2</u></em><em><u>8</u></em>

<em><u>1</u></em><em><u>4</u></em><em><u>K</u></em><em><u>=</u></em><em><u>1</u></em><em><u>4</u></em>

<em><u>K</u></em><em><u>=</u></em><em><u>1</u></em>

<em><u /></em>

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How do you do simultaneous equations by the method or substitution?​
ozzi

Answer:

Here's the simplest example possible: let's say x + y = 3 and x - y = 1. Solve the second equation for x by adding y to both sides: (x - y) + y = 1 + y. So x = 1 + y. Take that value of x, and substitute it into the first equation given above (x + y = 3).

5 0
3 years ago
In the number 8246315 what sigit is in the ones place​
Fed [463]

Answer:

5

Step-by-step explanation:

The ones place is the one most to the right that isn't after a decimal point.

4 0
2 years ago
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Sophia 4/8 yards of string. She used 1/6 of the string for a school project how many yards of string did she use for her project
MariettaO [177]
We will start off by simplifying 4/8 to 1/2

then we will multiply the fractions because it says "of"

1/2 × 1/6=1/12

therefore the answer is C. 1/12
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3 years ago
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A hairdryer transfers 36,000J in one minute, what is the power rating of the hairdryer?
Verdich [7]

Answer:

1. 600 watts

2. 35640 J

3. 55%

4. 20 J

5. The cost of running the fire is 8p.

Step-by-step explanation:

1. Energy = 36 000 J , t = 1 minute = 60 seconds

Power = \frac{energy}{time}

           = \frac{36000}{60}

          = 600 watts

2. Power = \frac{work done}{time}

⇒ work done = Power × time

                      = 99 × 360

                      = 35640 J

3. Efficiency = (Output / Input) × 100

                    = \frac{55}{100} × 100

                    = 55%

4. Work done = Force × distance

                      = 5 × 4

                      = 20 J

5. Given that 1 KWh cost 2p, Power = 4 KW and time = 4 hours.

  Power = \frac{energy}{time}

Energy = Power × time

            = 4 × 4

           = 16 KWh

The cost of running the fire = \frac{16}{2}

                = 8p

3 0
3 years ago
Write in slope intercept form an equation of the line that passes through the given points. (-1,7) , (3,-1)
Tcecarenko [31]

Answer! :

y = -2x + 5

Step by Step! :

slope intercept form:

y = mx + b

m being slope, b being the y intercept.

To find the slope, use this equation:

y^2 - y^1 / x^2 - x^1

Plug in your points.

(-1) - (7) / (3) - (-1)

-8 / 4

-2 is your slope! (y = -2x + b)

To solve for b, plug in any one of your points and solve for b. Let's use (3, -1)

-1 = -2(3) + b

-1 = -6 + b

5 = b

Your new equation is...

y = -2x + 5

6 0
2 years ago
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