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Dmitrij [34]
2 years ago
9

Solve. 2a + 4 > 12 .

Mathematics
2 answers:
Sauron [17]2 years ago
6 0

Answer:

{a | a > 4}

Step-by-step explanation:

You solve the equation just like you would.

And then you get a<4

soooo hope this helps:)

Stay safe

katen-ka-za [31]2 years ago
4 0

Answer:

a=10

Step-by-step explanation:

a=10

2+10=12

12+4=16

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Match the pairs of equations that represent concentric circles. Tiles
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I will explain you and pair two of the equations as an example to you. Then, you must pair the others.

1) Two circles are concentric if they have the same center and different radii.

2) The equation of a circle with center xc, yc, and radius r is:

(x - xc)^2 + (y - yc)^2 = r^2.

So, if you have that equation you can inmediately tell the coordinates of the center and the radius of the circle.

3) You can transform the equations given in your picture to the form (x -xc)^2 + (y -yc)^2 = r2 by completing squares.

Example:

Equation: 3x^2 + 3y^2 + 12x - 6y - 21 = 0

rearrange: 3x^2 + 12x + 3y^2 - 6y = 21

extract common factor 3: 3 (x^2 + 4x) + 3(y^2 -2y) = 3*7

=> (x^2 + 4x) + (y^2 - 2y) = 7

complete squares: (x + 2)^2 - 4 + (y - 1)^2 - 1 = 7

=> (x + 2)^2 + (y - 1)^2 = 12 => center = (-2,1), r = √12.

equation: 4x^2 + 4y^2 + 16x - 8y - 308 = 0

rearrange: 4x^2 + 16x + 4y^2 - 8y = 308

common factor 4: 4 (x^2 + 4x) + 4(y^2 -8y) = 4*77

=> (x^2 + 4x) + (y^2 - 2y) = 77

complete squares: (x + 2)^2  - 4 + (y - 1)^2 - 1 = 77

=> (x + 2)^2 + (y - 1)^2 = 82 => center = (-2,1), r = √82

Therefore, you conclude that these two circumferences have the same center and differet r, so they are concentric.
5 0
3 years ago
A store is instructed by corporate headquarters to put a markup of 25​% on all items. An item costing ​$24 is displayed by the s
larisa [96]

Answer: The correct selling price is $29.97.

Step-by-step explanation:

Since we have given that

Cost price of an item = $27

Mark up rate = 11%

So, Amount of mark up would be

So, Amount after mark up would be

Hence, the correct selling price is $29.97.

The manager's likely error is that he has put the selling price the mark up amount only i.e $2.9≈$3 instead of adding the mark up amount to the cost price.

5 0
3 years ago
Read 2 more answers
Which recursive formula represents the geometric sequence?<br> 25, 20, 16,
slavikrds [6]

Answer:

Step-by-step explanation:

a_n=\frac{4}{5}(a_{n-1})

6 0
2 years ago
I am very confused, if somebody could help me it would mean alot. :)
Yuliya22 [10]

Answer:

3n+7=16

Step-by-step explanation:

3(3)+7=16

9+7=16

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The second one is wrong(x=18)

8 0
3 years ago
How do you find the area of a triangle???? PLEASE HELP
irinina [24]

Answer:

find the base 1st then Height.You should be able to get your Area after doing those steps correctly

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