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svetlana [45]
3 years ago
12

Are these expressions equivalent explain why or why not? 42+35 and 7( 6+5)

Mathematics
2 answers:
fredd [130]3 years ago
6 0

Answer:

Yes, the expressions are equivalent. If you sum 42 + 35, you get 77. If you simplify 7(6 + 5), you also get 77

Explanation: This is the exact answer they want. Hope it helped ;)

scoundrel [369]3 years ago
3 0

Answer:

<h2>No,they are not</h2>

Step-by-step explanation:

An algebraic expression must contain and unknown value to solve for.

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Is it linear or exponential pls help
vlada-n [284]

Answer:

Exponential

Step-by-step explanation:

4 0
3 years ago
Which of the following numbers is probably an irrational number? 1.) -5 2.) 1.6490221... 3.) 3/4 4.) 0
USPshnik [31]

Answer:

Choice 2.

Step-by-step explanation:

And irrational number is a number that never ends (or keeps repeating random decimals forever)

3 0
3 years ago
Read 2 more answers
Nelda needs to wrap a holiday gift box. The box is in the shape of a rectangular prism with the dimensions shown.
kari74 [83]

Answer:

416 in²

Step-by-step explanation:

Given that:

Height. h = 4 in

Length = 12 in

Width = 10 in

The surface area of a rectangular prism is obtained using the relation :

Surface Area, S = 2(lw + lh + wh)

S = 2[(10*12) + (10*4) + (12*4))

S = 2(120 + 40 + 48)

S = 2(208)

S = 416 in²

8 0
3 years ago
Evaluate 0.67y + 4 when y = 2 and when y = -2
jarptica [38.1K]

Answer:

2.66 and 4.34

Step-by-step explanation:

To evaluate, substitute the values of y and solve.

So, when y =-2

0.67y + 4 = -1.34 + 4 = 2.66

And when y = 2

0.67y + 4 = 1.34 + 4 = 4.34

Hope this helps.

5 0
3 years ago
Read 2 more answers
Match the pairs of equations that represent concentric circles. Tiles
Darina [25.2K]
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
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