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Can someone answer and explaine this to me

Mathematics 18/01/2020 12:19 PM answersmine
4x - 26 = 3x + 4
-3x          -3x
x - 26 = 4
    +26   +26
x = 30
Since the 2 angles are opposite of each other you would set them equal to each other.

Which pairs of angles in the figure below are vertical angles?

Mathematics 18/01/2020 12:19 PM answersmine
It is A, C
 because they are all the same

Which pairs of angles in the figure below are vertical angles?

Mathematics 18/01/2020 12:19 PM answersmine

Answer:

The correct option are A and C.

Step-by-step explanation:

If two lines intersect each other at a point, then each of the pairs of opposite angles made by these lines are called vertical angles.

From the given figure it is noticed that the line SA and DE intersect each other at point O.

\angle EOA=\angle DOS

\angle SOE=\angle DOA

The line OB touch the lines SA and DE. It does not intersect the lines, therefore the line OB does not make any vertical angle.

Therefore option A and C are correct.

How many solutions does this linear system have? Y=-6x+2 and -12x-2y=-4

Mathematics 18/01/2020 12:19 PM answersmine

We can solve the system of equations to check the number of system of the solutions.

y=-6x+2 ...(1)

-12x-2y=-4 ...(2)

Substitute -6x+2 for y in equation (2). So,

-12x-2(-6x+2)=-4

-12x+12x-4=-4 (By distribution property).

-4=-4 (-12x and +12x has been cancel out).

Notice x has vanish from the above equation and we are left with -4=-4 which is correct.

So, the system has infinte number of solutions.

Solve the equation. x/5+9 = 4

Mathematics 18/01/2020 12:19 PM answersmine
If you want to solve the equation x / 5 + 9 = 4, then you'll have to make x be on it's own, like this: x = -5 * 5, which gives us -25! Hope this helped! Brainliest is always appreciated.

Can someone help me please

Mathematics 18/01/2020 12:19 PM answersmine
Hello!

Judging by the model and question at hand I have figured out that the best way to come across the solution you are looking for is to use the complementary angle rule!

This entitles that ∠3+∠4=90°

And we already have one of these angles!
So, the new equation we should have is ∠4+39°=90°

The next step you should take is to isolate the angle!
To do this you want to subtract 39° from both sides of the equation. 
The outcome should look something like this ∠4=51°. 

And thus your answer! m∠4=51°

Hope this helped! 
-Blake

What is the value of [-12]?TIMED A. -13 B. -12 C. 12 D. 13

Mathematics 18/01/2020 12:19 PM answersmine

Answer:12

Step-by-step explanation:i did e2020

What are the values of x in the equation 4x^2+4x-3=0

Mathematics 18/01/2020 12:19 PM answersmine
I have an answer and an explanation!

ANSWER:X=\frac{1}{2}   (or) x= \frac{-3}{2}


Explanation:

{Let's solve your equation step-by-step.}
4 x^{2} +4x-3=0

{Step 1: Factor left side of equation.}
(2x-1)(2x+3)=0

{Step 2: Set factors equal to 0.}
2x-1=0 (or) 2x+3=0

What is the domain of the function y=2sqrt x-6?

Mathematics 18/01/2020 12:19 PM answersmine
(x - 6) cannot be negative  as there are no real square roots of a negative quantity  so x must be >= 6

So the domain is  6 =< x < infinity

What is the most accurate name for the polygon shown in the figure? A. decagon B. hexagon C. octagon D. heptagon

Mathematics 18/01/2020 12:19 PM answersmine
C. octagon but even though u dont have no picture

What is the length of MN? (And how do you get it)

Mathematics 18/01/2020 12:19 PM answersmine

Answer:  The correct option is

(A) 12.

Step-by-step explanation:  We are given to find the length of MN from the figure shown.

From the figure, we note that LMN is an isosceles triangle where

m\angle L=m\angle N=63^\circ,~~LM=3x,~~MN=x+8.

We know that

in an isosceles triangle, the lengths of the sides opposite to the equal angles are equal.

So, in triangle LMN, we have

LM=MN\\\\\Rightarrow 3x=x+8\\\\\Rightarrow 3x-x=8\\\\\Rightarrow 2x=8\\\\\Rightarrow x=\dfrac{8}{2}\\\\\Rightarrow x=4.

Therefore, the length of side MN is

MN=x+8=4+8=12.

Thus, the required length of MN is 12 units.

Option (A) is CORRECT.

Solve this system of equations. 2x + 6y = −6, 4x − 3y = −12

Mathematics 18/01/2020 12:18 PM answersmine
It would be (-3, 0) (work is shown above)

What is the domain of the function?

Mathematics 18/01/2020 12:18 PM answersmine
There are no real roots  of  √x  where x is negative.
so the domain is  0 ≤ x < ∞

A cube has a surface area of 100 square inches. Which choice is closest to the length of an edge of the cube?

Mathematics 18/01/2020 12:18 PM answersmine

Answer:

4.08 inches.

Step-by-step explanation:

A cube has six sides, and each of the sides has area of a^2, where a is the length of the edge of the cube.

Thus the total surface area of the cube is

A=6a^2.

Now we are told that this surface area is 100 square inches, therefore A=100, and now we can solve for a:

a=\sqrt{\frac{A}{6}} = \sqrt{\frac{100}{6}}=\boxed{4.08\: inches.}

PLS HELP!! How is the graph of the function on the left different from the graph of the function on the right ?

Mathematics 18/01/2020 12:18 PM answersmine
The answer is C because a line contains all the values (including decimals) and the graph on the right only has the integer values (positive and negative whole numbers).

Given: x - 8 > -3. Choose the solution set. {x | x R, x > -9} {x | x R, x > -5} {x | x R, x > 5} {x | x R, x > 14}

Mathematics 18/01/2020 12:18 PM answersmine
X - 8 > -3
x - 8 + 8 > -3 + 8
x > 5 

The answer is the third choice.

Which values are solutions to the inequality below? Check all that apply. √ x<6 A.22 B.1296 C.77 D.-2 E.17 F.36

Mathematics 18/01/2020 12:18 PM answersmine
I have an answer!

ANSWER: [F] 36     Only 1 Answer!!!

No Explanation Provided!!!

Compute the standard deviation of the following set of data to the nearest whole number: 8, 12, 15, 17, 18 a) 3 b) 4 c) 13 d) 14

Mathematics 18/01/2020 12:18 PM answersmine
We have that

set of data [8, 12, 15, 17, 18]

step 1
Find the mean
[8+ 12 + 15 + 17 + 18]/5-------> 70/5------> 14

step 2
 for each number: subtract the Mean and square the result
(8-14)²----->36
(12-14)²----> 4
(15-14)²----> 1
(17-14)²----> 9
(18-14)²----> 16

step 3
 work out the mean of those squared differences
[36+4+1+9+16]/5-----> 66/5-----> 13.2----> 
this value is called the "Variance"

step 4
Take the square root of that
standard desviation=√13.2-----> 3.63-------> 4

the answer is
4

A mother is 3 times as old as her son.if the sum of their age was 38 five years ago,how old is mother and son now?

Mathematics 18/01/2020 12:18 PM answersmine
X=mother's age
y=son's age

3y=x
x+y=38+(5*2)

therefore x=36 and y=12

.Instructions:Select the correct answer. The half-life of helium-5 is 7.6 × 10-22 seconds, and the half-life of helium-9 is 7 × 10-21 seconds. Approximately how many times greater is the half-life of helium-9 than that of helium-5? 2 times 7 times 9 times 11 times

Mathematics 18/01/2020 12:18 PM answersmine
The half-life of helium-5 is 7.6 × 10^{-22} seconds, and the half-life of helium-9 is 7 × 10^{-21} seconds.

Approximately  \dfrac{7 \cdot 10^{-21}}{7.6\cdot 10^{-22}} = \dfrac{7}{7.6\cdot 10^{-1}} = \dfrac{7}{0.76} =9 the half-life of helium-9 is greater than that of helium-5.
Answer: 9 times.

PLS HELP! What could the graph of the function shown below represent?

Mathematics 18/01/2020 12:18 PM answersmine
The answer would be A.
B is wrong cause temperature increases and decreases.
C is wrong cause the dot would be curved near the end
D is wrong cause how could 1 line represent 2 measures of a shape

What is equivalent to the polynomial (4x+3)(3x-8)

Mathematics 18/01/2020 12:17 PM answersmine
The equivalent polynomial is 12x^2 -23x - 24.

You can get this by multiplying the two parenthesis by each other.

 First start by multiplying the two front numbers:
4x * 3x = 12x^2

Then multiply the outermost numbers:
4x * -8 = -32x

Then multiply the innermost numbers:
3x * 3 = 9x

Then multiply the last numbers: 
3* -8 = -24

Now combine all of them to get the above polynomial. 

Solve (x + 1 < 4) ∩ (x - 8 > -7). {x | 1 < x < 3} {x | x < 3 or x > 1} {all real numbers}

Mathematics 18/01/2020 12:17 PM answersmine
When solved 
(x + 1 < 4) ∩ (x - 8 > -7) 
becomes:
(x+1-1 < 4-1) ∩ (x - 8 +8 >  -7+8 ) 
(x < 3) ∩ (x > 1).
and if you change places it will become even more obvious:
 ( 1<x ) ∩ ( x < 3 )
meaning:  x is set of all numbers greater than 1 and less than 3 or otherwise: 
{x | 1 < x < 3}

Help me please.........

Mathematics 18/01/2020 12:17 PM answersmine
The 2 red lines on the triangle mean that the 2 sides are equal.

Because the 2 sides are equal, Angle D is the same as angle C.

So now angle C & D are both 52 degrees, we can find Angle E

180 - 52 - 52 = 76 degrees

Angle DEF + Angle E need to equal 180 degrees

Angle DEF = 180 - 76 = 104 degrees

Write the equation in standard form then factor the left side of the equation 2x'2+7x=15

Mathematics 18/01/2020 12:17 PM answersmine
The equation in standard form should be 2x^2 + 7x - 15 = 0

Factored the expression is (2x - 3)(x + 5).

In order to find the factored portion, you must look for factors of the front number (2) to use in the front of the parenthesis and factors of the last number (-15) to go in the end. 

When we use the ones that we have above, it distributes to the overall end result. 

(2x - 3)(x + 5)
2x^2 - 3x + 10x - 15
2x^2 + 7x - 15