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svetoff [14.1K]
3 years ago
12

2X -3 =12 what is the answer

Mathematics
2 answers:
kondor19780726 [428]3 years ago
7 0

Answer:

x = 7.5

Step-by-step explanation:

So the equation looks like this:

2X -3 =12

So we are first going to get rid of -3 by adding 3 to both sides of the equal sign:

2X -3 = 12

    + 3   +3

SO the equation looks like this now:

2x = 15

Now we are going to segregate the variable x by dividing 2x and 15 by 2:

2x/2 = 15/2

x = 7.5

So in order to check our work we are going to substitute 7.5 where the x variable is in the equation:

2X -3 =12 or 2(7.5) - 3 = 12

2(7.5) - 3 = 12

15 - 3 = 12

12 = 12

So our answer to what the variable x equals is 7.5.

I hope this helps you!!

yulyashka [42]3 years ago
5 0

Answer:

Step-by-step explanation:

2x-3= 12

   +3  +3

2x  =  15

/2       /2

x=      7.5

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2 years ago
A sociologist recently conducted a survey of senior citizens who have net worths too high to qualify for Medicaid but have no pr
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Answer:

a) s= 9.74

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b) Median= 74

B. 74

Step-by-step explanation:

Part a

We have the following dataset given:

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We can begin calculating the sample mean with the following formula:

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Now we can calculate the sample deviation with the following formula:

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And after replace we got:

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Part b

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And the median would be the value in the position 13 and we got:

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6 0
3 years ago
1. The height of a missile t seconds after it has been fired is given by h=4.9t^2+44.1t. How many seconds will it take for the r
asambeis [7]

Answer:

The rocket will take 4.5 seconds to reach its maximum height.

Step-by-step explanation:

The height of a missile t seconds after it has been fired is given by h=-4.9*t²+44.1*t

This function is a quadratic function of the form f (x) = a*x² + b*x + c. In this case a=-4.9, b=44.1 and c=0

To calculate how many seconds it will take for the rocket to reach its maximum height, I must calculate the maximum of the function. The maximum of a quadratic function is the vertex of the parabola. The x coordinate of the vertex will be simply: x=\frac{-b}{2*a}. The y coordinate of the vertex corresponds to the function evaluated at that point.

In this case the x coordinate of the vertex corresponds to the t coordinate. In other words, by calculating the x coordinate of the vertex, you are calculating the maximum time t it will take for the rocket to reach its maximum height. So:

t=\frac{44.1}{2*(-4.9)}

t=4.5

<u><em>The rocket will take 4.5 seconds to reach its maximum height.</em></u>

7 0
2 years ago
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