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2 years ago

Select the correct answer.

Mathematics

1 answer:

vivado [14]2 years ago

4 0

Answer:

B will be the answer...

Step-by-step explanation:

The second equation in system B is only in terms of y, so we need to use elimination to eliminate the x term from the second equation in system A.

To do that, we need to multiply the first equation by 5.

5 (-x − 2y = 7)

-5x − 10y = 35

Add to the second equation. Notice the x terms cancel out.

(-5x − 10y) + (5x − 6y) = 35 + (-3)

-16y = 32

Combining this new equation with the first equation from system A will get us system B.

-x − 2y = 7

-16y = 32

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scoundrel [369]

Answer:

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Step-by-step explanation:

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3 years ago

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vodomira [7]

<h3>Solution:</h3>

Given, side (a) = x+3
We know, surface area of a cube = 6a^2
Therefore, the surface area of the cube

<h3> </h3><h3> $6(x + 3) ^{2} \\ = 6( {x}^{2} + 6x + 9) \\ = 6 {x}^{2} + 36x + 54$ </h3><h3>Answer:</h3>

The answer is

${6x}^{2} + 36x + 54$

<h3>Hope it helps.</h3>

Sorry for delay

3 0

3 years ago

4 what’s the answer to this question

lesantik [10]

D. 1/2

We have 4 different suits and we want to know probability of getting a heart or diamond.

We have 2/4 or 1/2 or 50% chance to pick up a heart or diamond card.

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4 years ago

The expression<br>3(x+6)-x<br>can be simplified to the form<br>2x + a)<br>What is the value of a?

timofeeve [1]

Answer:

a = 18

Step-by-step explanation:

3(x+6)-x = 2x + a

Distribute

3x +18 -x = 2x+a

2x +18 = 2x+a

Subtract 2x from each side

18 = a

8 0

3 years ago

5x^2 +7x+4=0 in A+bi Form

ElenaW [278]

Answer:

Step-by-step explanation:

The discriminate is going to be the key to this problem.

Givens

a = 5

b = 7

c = 4

Formula

$\text{x = }\dfrac{ -b \pm \sqrt{b^{2} - 4ac } }{2a}$

Solution

$\text{x = }\dfrac{ -7 \pm \sqrt{7^{2} - 4*5*4 } }{2*5}$

$\text{x = }\dfrac{ -7 \pm \sqrt{-31} }{10}$

$\text{x = }{ -0.7 \pm 0.1*\sqrt{31}*i }$

I have shown all the multiplication signs because it is clearer that way. You are going to have to figure out how to format the answer. If my answer is not among those you have, could you please give me the choices?

x1 = -0.7 + 0.1 sqrt(31) i

x2 = -0.7 - 0.1 sqrt(31) i

6 0

3 years ago