Help please !! Right answer

Answer:

True

Step-by-step explanation:

Answer:

true

Step-by-step explanation:

Answer:

(- 5, - 3 )

Step-by-step explanation:

Given the 2 equations

- 3x + 10y = - 15 → (1)

5x - 7y = - 4 → (2)

Multiplying (1) by 5 and (2) by 3 and adding the result, eliminates the x- term.

- 15x + 50y = - 75 → (3)

15x - 21y = - 12 → (4)

Add (3) and (4) term by term to eliminate x, that is

29y = - 87 ( divide both sides by 29 )

y = - 3

Substitute y = - 3 into either of the 2 equations and solve for x

Substituting into (1)

- 3x + 10(- 3) = - 15

- 3x - 30 = - 15 ( add 30 to both sides )

- 3x = 15 ( divide both sides by - 3 )

x = - 5

solution is (- 5, - 3 )

Answer:

A.

Step-by-step explanation:

x < -6 means that x is lesser than -6. Thus, C and D are wrong. A filled up dot means that -6 is also a possible number for x, but here it says that x is lesser than -6, so it cannot be -6 itself. Thus, B with the filled up dot is also wrong.

Answer:

A linear equation

Step-by-step explanation:

It just is

Answer:

Step-by-step explanation:

2x + -1y = -42

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add 'y' to each side of the equation.

2x + -1y + y = -42 + y

Combine like terms: -1y + y = 0

2x + 0 = -42 + y

2x = -42 + y

Divide each side by '2'.

x = -21 + 0.5y

Simplifying

x = -21 + 0.5y

hope helps you

Answer:

8.5

Step-by-step explanation:

X^2 = 9^2 - 3^2

x^2 = 81 - 9

x^2 = 72

x = √72

x = 8.485

Answer:

The answer would be 9

Step-by-step explanation:

Answer:

with what?

Step-by-step explanation:

Answer:

1. positive infinity

2. negative infinity

Step-by-step explanation:

I just answered this question and got it right

Answer:

Step-by-step explanation:

Answer: D

Step-by-step explanation:

Answer:

The solution of this system of linear equations is [tex](x,y) = (-3,-2)[/tex].

Step-by-step explanation:

Let be the following system of linear equations:

[tex]2\cdot x - 7\cdot y = 8[/tex] (1)

[tex]-3\cdot x + 2\cdot y = 5[/tex] (2)

From (1) we clear [tex]y[/tex]:

[tex]2\cdot x -8 = 7\cdot y[/tex]

[tex]y = \frac{2\cdot x - 8}{7}[/tex]

And we apply this variable in (2):

[tex]-3\cdot x+2\cdot \left(\frac{2\cdot x -8}{7} \right)= 5[/tex]

[tex]-3\cdot x +\frac{4}{7} \cdot x -\frac{16}{7} = 5[/tex]

[tex]-\frac{17}{7}\cdot x = \frac{51}{7}[/tex]

[tex]x = -\frac{51}{17}[/tex]

[tex]x = -3[/tex]

And the value of [tex]y[/tex] is:

[tex]y = \frac{2\cdot (-3)-8}{7}[/tex]

[tex]y = -\frac{14}{7}[/tex]

[tex]y = -2[/tex]

The solution of this system of linear equations is [tex](x,y) = (-3,-2)[/tex].

Answer:2n + 3

Step-by-step explanation:

The provided expression is equivalent to the first expression in the option, choice (A) is correct.

It is defined as the combination of constants and variables with mathematical operators.

The question is incomplete.

The complete question is in the picture, please refer to the attached picture.

We have expressions:

[tex]\rm = \dfrac{2n}{n+4}+\dfrac{7}{n-1}[/tex]

[tex]\rm =\dfrac{2n\left(n-1\right)}{\left(n+4\right)\left(n-1\right)}+\dfrac{7\left(n+4\right)}{\left(n+4\right)\left(n-1\right)}[/tex]

[tex]\rm =\dfrac{2n^2+5n+28}{\left(n+4\right)\left(n-1\right)}[/tex]

Thus, the provided expression is equivalent to the first expression in the option, choice (A) is correct.

Learn more about the expression here:

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Answer:

The first one is 6√10

The second one is −48√3

The last one is 28√2

Step-by-step explanation:

Answer:

The answer is below

Step-by-step explanation:

Which equation in slope-intercept form represents a line that passes through the point (2,3) and is perpendicular to the line y−9=23(x+7)

Solution:

The equation of a line in slope intercept form is given as y = mx + b, where m is the slope and b is the y intercept.

Given a line y−9=23(x+7)

y - 9 = 23x + 161

y = 23x  + 170. The slope of this line comparing with y = mx + b gives m = 23

Two lines are perpendicular if the product of their slope gives -1.

Let [tex]m_1[/tex] be the slope of the perpendicular line, hence:

[tex]m_1(23)=-1\\\\m_1=\frac{-1}{23}[/tex]

Since the perpendicular line passes through (2, 3), we can get its equation using:

[tex]y-y_1=m_1(x_x_1)\\\\y-3=\frac{-1}{23}(x-2)\\\\y= \frac{-1}{23}x+\frac{2}{23}+3\\\\ y= \frac{-1}{23}x+\frac{71}{23}[/tex]

Answer:

2400 m2

Step-by-step explanation:

the eqaution is 40*60

Answer:

2400m²

Step-by-step explanation:

that is the answer

40 x 60 = 2400m²

Answer:

im pretty sure 120.9

Step-by-step explanation:

Answer:

120.9

Step-by-step explanation:

0.65 times 186 is 120.9

Answer:

1.9

Step-by-step explanation:

2x+7=10.8

2x=3.8

x=1.9

1.9x2=3.8+7=10.8

The required number is 1.9, when multiply by 2 and add 7 to the product gives 10.8.

The equation model is defined as the model of the given situation in the form of an equation using variables and constants.

Here,
let the number be x,
According to the question,
2x + 7 = 10.8

Simplifying the above expression,
2x = 10.8 - 7
2x = 3.8

x = 1.9

Thus, the required simplified value of the given equation model is 1.9.

Learn more about models here:
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Answer: 80 degrees

Step-by-step explanation:

Answer:

80 degrees!

Step-by-step explanation:

There's this weird phenomenon with parallel lines, that if you trace a line over it, you would get the same angle on the opposite side of the line.

Answer:

Step-by-step explanation:

24=6*4

2*2*2*3

108=2*2*3*3*3

gcf=12

the mechanic will work at least 6hours

Answer:

Step-by-step explanation

A = (3.14)(r^2)

r^2 = (1/2 d) = 13.5^2 = 182.25

A = 3.14 x 182.25 = 572.265 unit sq.

Answer:

(a,b) to (-a,-b)

Step-by-step explanation:

You can think of this as folding the paper horizontly and vertically, and see where the new point lies. You see that the x coordinate changes its sign  when the paper folds vertically, and the y coordinate changes its sign when folded horizontally.

But in general, if you have point (a,b) and if you rotate it 180 degrees, you just switch the signs, and you will get (-a,-b).

Ex. (-6,5) rotates 180 degrees and becomes (6,-5)

Answer:

(6,-5)

Step-by-step explanation:

Answer:

The approximate 90% confidence interval is;

70,244 to 70,732

Step-by-step explanation:

Here, we want to calculate the approximate 90% C.I for the situation

Mathematically;

CI = mean ± (z * SD)/√n

From the question;

mean = 70,438

SD = 645.3

n = 30

we can get z from the CI table

90% CI is same as; 1.645 z-score

So , substituting these values;

CI = 70,438 ± ( 1.645 * 645.3)/√30

CI = 70,438 ± 194

So the CI = 70,438 -194 to 70,438 + 194

= 70,244 to 70,732

Answer:

B. 70,244 and 70,632

Please give me brainliest, I really need it.

Answer: 7.5

Step-by-step explanation:

Because it would be 25/100 times 30 because 25% and then it would be simplified inti 1/4 times 30 then it would be 7.5.

Answer:

he faked too much

Step-by-step explanation:

Answer:

7√2

Step-by-step explanation:

Answer:

I think that is simplyfied

Step-by-step explanation: