Answer:
The answer is either 1.5 or 0.667
Step-by-step explanation:
x2+3x-9=0
x2+3x=9
6x=9
x=1.5
or
x=667
the value of 'h' used to solve the equation by completing the square method is [tex]\frac{9}{4}[/tex]
Given :
An equation and the first step in its solution are shown.
Equation: [tex]x^2 + 3x -9 = 0[/tex]
Step 1: [tex]x^2 + 3x + h = 9 + h[/tex]
In completing the square method , we take the coefficient of x and divide it by 2 and then square it
coefficient of x is 3
divide it by 2 , so we get [tex]\frac{3}{2}[/tex]
Then we square it [tex](\frac{3}{2} )^2\\\frac{9}{4}[/tex]
Then we add it on both sides of the equation
[tex]x^2 + 3x + \frac{9}{4} = 9 + \frac{9}{4}[/tex]
So, the value of 'h' used to solve the equation by completing the square method is [tex]\frac{9}{4}[/tex]
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Two chemicals are mixed in a test tube and a chemical reaction takes place. If this reaction is endothermic and the test tube is touched, which of the following best describes what is felt?
The test tube is cold.
The test tube is warm.
The test tube is very hot.
The test tube is the same temperature as the air.
The test tube is cold best describes what is felt.
Option A is the correct answer.
What is a chemical reaction?A chemical reaction is a process that leads to the transformation of one set of chemical substances into another.
In other words, it is the process of breaking and forming chemical bonds between atoms to create new compounds with different properties than the original substances.
We have,
An endothermic reaction is a type of chemical reaction that absorbs heat from the surrounding environment, resulting in a decrease in temperature.
In this case,
The chemical reaction that occurred in the test tube absorbed heat from the surroundings, including the air and the test tube itself.
As a result, the temperature of the test tube decreased, making it feel cold to the touch.
Thus,
The test tube is cold best describes what is felt.
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Please help-
(Ignore the graph part)
Answer:
Uhm I thought I knew the answer but I don't
Step-by-step explanation:
Sorry I'm no help have a good day tho someone else can probably answer it right tho... Hope you have a good day!!
Can someone plz help
Answer:
it is either 300 or 10 hope this helps please mark brainliest
Step-by-step explanation:
Please help this is due in 2 periods.
Answer:
21
Step-by-step explanation:
Use Pemdas.
Parentesis first so 5+4 = 9 and 8-6=2 so, 9X2=18+3=21
Consider z = 3StartRoot 3 EndRoot + 3i. What happens to the modulus and argument when z is raised to the 4th power?
Answer:
It's A
Step-by-step explanation:
Just took it and it matches
The modulus increased by 216 and the argument increased by π/2. Option A is correct
The number that constitutes of real and imaginary numbers are called complex numbers.
[tex]z = 3\sqrt{3} + 3i\\z^4 = (3\sqrt{3} + 3i)^4\\z^4 = 648(-1+\sqrt{3}i )[/tex]
Modulus and argument of [tex]z^4[/tex] is given by.
[tex]|z^4| = 648\sqrt{1+3} \\|z^4| = 648\sqrt{4} \\|z^4| = 648*2\\|z^4| = 1296[/tex]
argument
[tex]\theta=tan^{-1}(\sqrt{3} /-1)\\\theta=tan^{-1}(-\sqrt{3} )\\\theta= -\pi /3[/tex]
similarly, the Modulus and argument of z is given by.
Modulus
|z| = 6
argument
[tex]\theta=\pi /6[/tex]
Now comparing Modulos and argument of [tex]z^4[/tex] and z
[tex]z^4[/tex]/z = 1296/6 = 216
[tex]\theta=\pi /6+\pi /3\\\theta=\pi /2[/tex]
Thus, The modulus increased by 216 and the argument increased by π/2. Option A is correct.
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WILL MARK BRAINLIEST PLEASE HELP
Answer:
(1,2)
Step-by-step explanation:
half it! :)
The square below represents one whole. Express the shaded area as a fraction, a decimal, and a percent of the whole.
Answer as a fraction = 1/2
Answer as a decimal = 0.5
Answer as a percent = 50%
========================================
Explanation:
There are 5 blue rectangles out of 10 total. This forms the fraction 5/10 and that reduces to 1/2 after dividing both parts by 5. Therefore, the fractions 5/10 and 1/2 are the same. Notice that exactly half of the entire figure is shaded blue.
Use long division or your calculator to find that 1/2 = 0.5 which converts to 50% when you move the decimal point 2 spots to the right.
Answer:
5/10 , 0.5 , 50%
Step-by-step explanation:
Please help me!!! Whoever best explains their answer will get brainliest!!!
Answer:
yellow I believe is the answer
Answer:
It is the yellow one.
Step-by-step explanation:
When you have 4x+2y=1 and -4x+4y=5 you subtract.
A recipe requires one quarter cup of milk as a base and then, in addition, 1 cup of milk for every 4 cups of flour. Choose a linear equation that describes the relationship.
A.y=4x + 4
B.y=4x+14
C.y=14x+4
D.y=14x + 14
A small number of cards has been lost from a complete pack. If I deal among four people, three cards remain. If I deal among three people, two remain and if I deal among five people, two cards remain. How many cards are there?
Good Luck!! First correct answer gets brainliest!!!
Answer:
There are 47 cards
Step-by-step explanation:
Trial and error
help please
Divide. 64.2 ÷ 100
Answer:
0.642 is the answer please give brailiest
Answer:
0.642 calculator bc I'm stüpìd
Brainliest to the first right, :))))
Answer:
y=8
Step-by-step explanation:
Select all equations that have infinite solutions.
А
2 - 2x = -2(x - 1)
B
2x + 7 = 2x – 7
С
5x + 4 = 5 (x + 4)
D
X – (x - 2) = x
E
5x
4x + 1
Answer:
Step-by-step explanation:
C
Answer:
B, C, and E, i might not be right though D:
Please help get value of x. I believe it is 7 but idk.
Answer:
It's 8
Step-by-step explanation:
A construction crew is extending a highway sound barrier that is 13 miles long. the crew builds 1/2 of a mile per week. Write an equation the represents the length Y (in miles) of the barrier after X weeks.
Answer:
y= 1/2x + 13
because the barrier is already 13 miles long, and they're adding 1/2 miles every week
The equation the represents the length Y (in miles) of the barrier after X weeks is y = (1/2)x + 13
A linear equation is in the form:
y = mx + b;
where m is the slope, b is the y intercept and y, x are variables.
Let y represent the length of the barrier after x weeks.
Since the crew builds 1/2 of a mile per week hence m = 1/2, Also the barrier is 13 miles long, hence b = 13, hence:
y = (1/2)x + 13
The equation the represents the length Y (in miles) of the barrier after X weeks is y = (1/2)x + 13
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Find the equation of the line that passes through the given points on the graph below.
Answer:
y = -4/3x - 1
Step-by-step explanation:
solve:[tex]\frac{x}{5}[/tex]=6.x
Help and you get BRANILEST I ALSO PUT 46 points
Answer:
C
Step-by-step explanation:
my teacher told me
Convert phrases to numerical expressions and solve
Ten to the power of four minus one thousand plus one thousand
Answer:
10000 - 1000 + 1000 = 10000
Step-by-step explanation:
10 to the forth power = 10000 - 1000 = 9000 + 1000 = 10000
11 more than a number q is negative 15 ; Solve for the variable.
Answer:
q = -26
Step-by-step explanation:
Set up an equation where q is the unknown number:
q + 11 = -15
Solve for q by subtracting 11 from both sides:
q + 11 = -15
q = -26
use the absolute value formula to express the distance between 9 and -8
Answer:
I think it's 17 I hope I'm right
Nick leaves his apartment and travels down two flights of stairs to get to the parking lot below ground level. Nick’s elevation, in feet, as it relates to time is represented by the sketch shown below.
Which statement best represents the three horizontal portions of the graph?
Nick's speed decreases.
Nick is moving but the elevation is constant.
Nick stopped but the elevation is decreasing.
Nick is moving at a constant rate as the elevation is decreasing.
Answer:
Nick’s speed decreases
Step-by-step explanation:
He’s not going at a steady speed, and his speed only decreases
Volume questionnnnnn
Answer:
a
Step-by-step explanation:
1. You have two playing cards with a sum of (−12) in your hand.
a. What two cards could you have?
b. You add two more cards to your hand, but the total sum of the cards remains the same, (−12). Give two different examples of two cards you could choose.
i need help please fast
-8x+2y>-6
y>-3+4x
Solve the system if equations pls help me
Ignore my username
solve for s: 6.49s + 8.32 = 27.79
Answer:
s=3
hope u have a great day
Answer:
s = 3
Step-by-step explanation:
STEPS FOR SOLVING LINEAR EQUATION
6.49s+8.32=27.79
Subtract 8.32 from both sides.
6.49s=27.79−8.32
Subtract 8.32 from 27.79 to get 19.47.
6.49s=19.47
Divide both sides by 6.49.
s=
6.49
19.47
Expand
6.49
19.47
by multiplying both numerator and the denominator by 100.
s=
649
1947
Divide 1947 by 649 to get 3.
s=3
help please
Dan works a paper route. He started out with 180 papers. He has 65 left to deliver. Write
and solve an equation to find the number of papers Dan has delivered.
Answer:
so if he has 180 papers now he has 65 the answer should be 115
Step-by-step explanation:
180-65=115
Answer: The Answer is 115. I belive this is correct, please comment if not.
Step-by-step explanation: Ok, so to find this answer all you have to do is subtract 180-65=115
Solve the inequality for x
-3x + 6 < 15
A) x < -3
B) x < -7
C) x > -3
D) x > -7
Answer: The answer is maybe a but b is close to a answer also so maybe a or b but c and d is no were close
Step-by-step explanation:
Answer:
the answer is A
Step-by-step explanation:
can u help me please
Answer: There is no solution
Step-by-step explanation:
First, move the 7 to the other side
y=3x-7
Then plug that into the second equation
6x-2(3x-7)=12
6x-6x+14=12
0x=-2
There is no solution