Find the vertex of a function f(x)=-3x^2+9x-15 by completing the square

Answers

Answer 1
The vertex will be (3/2, - 33/4)

Related Questions

Find the exact area of a circle having the given circumference.

4(sqrt3 PI ) ...?

Answers

The solution to the problem is as follows:

since C =  2*pi*r = 4sqrt(3)*pi:

r = C/2*pi = 4sqrt(3)*pi / 2* pi = 2sqrt(3)

Therefore, to solve for Area:

Area = pi*r^2 = pi*(2sqrt(3))^2 = 12pi

The area is 12pi.


Answer:

12(pi)

Step-by-step explanation:


The school that Scott goes to is selling tickets to a fall musical. On the first day of ticket sales the school sold 1 senior citizens tickets and 12 students tickets for a total of $130. The school took in $80 on the second day by selling 5 senior citizens tickets and 3 student tickets. Find the price of a senior citizens ticket and the price of a student tickets

Answers

I hope this helps you
I think you just add 12+1 which gets you 13 and then divide 130 by 13 which gives you 10. Then add 5+3 which gives you 8 and then divide 80 by 8 which also gives you 10. So 10 dollars a person. I might be wrong :/

Find the domain and range of the relation and determine whether it is a function.
Domain: positive integers; range: positive integers; no, it is not a function.
Domain: x > 3; range: y > 0; yes, it is a function.
Domain: all real numbers; range: all real numbers; yes, it is a function.
Domain: x ³ 0; range: y > 3; no, it is not a function.



Answers

Answer:

y>0

Step-by-step explanation:

Jolie uses 2 tomatoes every day to prepare her salad. If n equals the number of tomatoes Jolie had before she made her salad and c equals the number of tomatoes left after the salad is made, which equation represents the number of tomatoes Jolie has after she made her salad?



n = 2 − c
c = n − 2
c = 2 − n
n = c − 2
please just give me the answer.

Answers

The answer is c = n - 2

n - the number of tomatoes before the salad is made
c - the number of tomatoes after the salad is made


Jolie uses 2 tomatoes (n - 2) every day to prepare her salad and then c tomatoes remained: n - 2 = c
Or:
c = n - 2

Answer:

d the answer is d

A piece of cloth is folded into a square with a side length measuring x inches. When it is unfolded, it has an area of x2 + 27x + 162 square inches.


Which could be the dimensions of the rectangular piece of cloth when it is unfolded? Remember, the area of a rectangle can be determined using the formula A = lw.

Answers

we need to factor the expression

[tex] x^{2} + 27x + 162 [/tex]

Equate to zero the expression

[tex] x^{2} + 27x + 162=0 [/tex]

Group terms that contain the same variable, and move the constant to the opposite side of the equation

[tex] x^{2} + 27x =-162 [/tex]

Complete the square. Remember to balance the equation by adding the same constants to each side

[tex] x^{2} + 27x +182.25=-162+182.25 [/tex]

[tex] x^{2} + 27x +182.25=20.25 [/tex]

Rewrite as perfect squares

[tex] (x+13.5)^{2}=20.25 [/tex]

[tex] (x+13.5)=(+/-)4.5 [/tex]

[tex] x1=-13.5+4.5= -9 [/tex]

[tex] x2=-13.5-4.5= -18 [/tex]

Hence

[tex] x^{2} + 27x + 162 =(x+9)*(x+18) [/tex]

Remember that the area of the rectangle is equal to

[tex] A=L*W [/tex]

therefore

the answer is

the dimensions of the rectangular piece of cloth could be

[tex] L=(x+18)\ inches\\ W=(x+9)\ inches [/tex]

graph the fraction 1/2 on the number line.

the number of equally sized spaces needed between 0 and 1 is ?

Answers

You have the graph and the answer to the question on the pdf file attached.

The gross weight of a package and its contents is 11 pounds 5 ounces . If the packaging weighs 1 pound 15 ounces , what's the net weight of the contents

Answers

9 pounds 6 ounces (net weight of contents)

Which term describes a rate in which the second quantity is 1?
unit rate
percent
proportion
ratio

Answers

The answer is unit rate! Hope this helps! :)

What is the exact value for the expression the square root of 56. − the square root of 14. + the square root of 126.? Simplify if possible.

the square root of 14.

4 the square root of 14.

2 the square root of 42.

8 the square root of 42.

...?

Answers

sqr root of 56 - sqr root of 14 + sqr root of 126= sqr root of (4x14) - sqr root of 14 + sqr root of (9x14)= 2(sqr root of 14) - (sqr root of 14) + 3(sqr root of 14)= 4(sqr root of 14)
The right answer will be B.

Answer:

B-  [tex]\sqrt(56)-\sqrt(14)+\sqrt(126)=14.966[/tex]

Step-by-step explanation:

Given equation : square root of 56 − the square root of 14 + the square root of 126    or     [tex]\sqrt(56)-\sqrt(14)+\sqrt(126)[/tex]

Solution of the equation :

[tex]\sqrt(56)-\sqrt(14)+\sqrt(126)[/tex]

= [tex]2\sqrt(14)-\sqrt(14)+3\sqrt(14)[/tex]

= [tex]\sqrt(14)(2-1+3)[/tex]

= [tex]4\sqrt(14)[/tex]

=14.966

Now,

square root of 14 =√14 =3.7414 the square root of 14 = 4√14 = 14.9662 the square root of 42= 2√42 = 12.9618 the square root of 42 = 8√42= 51.845

Therefore, Option B is correct

which ratio is proportional to 10/24

A 20/36
B 5/8
C 35/84
D 5/6

Answers

Answer:

  C 35/84

Step-by-step explanation:

The given ratio is less than 1/2. Only one answer choice is less than 1/2: 35/84.

__

The given ratio reduces to 5/12. The reduced ratios of the answer choices are ...

  A  5/9

  B  5/8

  C 5/12 . . . . your answer

  D  5/6

What segment is an altitude of triangle ABC?
segment AC

segment BC

segment BD

segment CD
...?

Answers

The best and most correct answer among the choices provided by your question is the third choice.

Line segment BD is the altitude of triangle ABC.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Sarah's age is five less than twice her sister's age. Sarah is fifteen years old.

Which equation could you use to solve for the age of Sarah's sister?

2x - 5 = 15
2(15) - 5 = x
15 = 5 - 2x
15 - 5 = 2x

Answers

let her sisters age be x.
=>sister .....x

Sarah.
twice x=2x. then less than 5
=> (2x-5 )
if Sarah = 15 years
by substation, 2x-5=15
The first one would be correct 

in the fraction 3/5 which statement best describes the denominator

Answers

The denominator in this case is 5 but I need the options 
The answer here is 5

what is the answer to this 10-4b

Answers

We have the formula |10 - 4b| where b is equal to 8

|10 - 4(8)|

|10 - 32|
|-22| = 22

The answer is 22.
10-(4 times 8)
10-32
-22

Hope this helps. 

Which transformations map the strip pattern onto itself

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Below are the choices that can be found elsewhere:


a horizontal translation and a 180° rotation

a horizontal translation and a reflection across a vertical line

a horizontal translation and a glide reflection

a horizontal translation only

The answer is the first one . 

Answer: a horizontal translation and a 180 rotation

Step-by-step explanation:

Of the students in ms. dancer's class, 6 walk to school. this represents 30% of her students. how many students are in ms. dancer's class?

Answers

[tex] \frac{30}{100}x=6[/tex]
x is the number of students in the class in total
[tex]30x=600[/tex]
[tex]x=20[/tex]

On Saturday, a local hamburger shop sold a combined total of 464 hamburgers and cheeseburgers. The number of cheeseburgers sold was three times the number of hamburgers sold. How many hamburgers were sold on Saturday?

Answers

The number of hamburgers will be 348.


What is an expression?

Expression in maths is defined as the collection of numbers variables and functions by using signs like addition, subtraction, multiplication, and division.

Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.

Given that On Saturday, a local hamburger shop sold a combined total of 464 hamburgers and cheeseburgers. The number of cheeseburgers sold was three times the number of hamburgers sold.

The number of hamburgers will be calculated as below:-

Cheeseburgers= x

Hamburgers= 3x

3x+x=464

4x=464

x=116

Substitute the value of x in expression.

Hamburgers= 3x

Hamburgers= 3 x 116 = 348

Therefore, the number of hamburgers will be 348.

To know more about an expression follow

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Final answer:

The local hamburger shop sold 116 hamburgers on Saturday. We determined this by setting up an equation where the number of hamburgers (H) plus three times the hamburgers (3H) equaled the total sales of 464 burgers, and then solving for H.

Explanation:

The question asks us to solve a basic algebra problem involving hamburgers and cheeseburgers. Let's define the number of hamburgers sold as H. Since the number of cheeseburgers sold was three times the number of hamburgers sold, we can represent the number of cheeseburgers as 3H. The total number of burgers sold was 464. Now, we can write down the equation:

H + 3H = 464

This simplifies to:

4H = 464

Now, we divide both sides by 4 to find the value of H:

H = 464 / 4

H = 116

So, the local hamburger shop sold 116 hamburgers on Saturday.

Solve the system using elimination.

5x + 4y = 12
3x – 3y = 18

Answers

Final answer:

To solve the system of equations using elimination, multiply one equation by a constant so that the coefficients of one variable will be the same in both equations. Then add or subtract the equations to eliminate that variable. Finally, solve for the remaining variable and substitute back to find the complete solution.

Explanation:

To solve the system of equations using elimination, we need to eliminate one variable by adding or subtracting the two equations. In this case, we can eliminate the variable y by multiplying the first equation by 3 and the second equation by 4. This will give us:

15x + 12y = 36

12x - 12y = 72

Next, we can add the two equations together to eliminate y:

27x = 108

Dividing both sides by 27, we find that x = 4.

Substituting this value of x back into one of the original equations, we can solve for y:

5x + 4y = 12

5(4) + 4y = 12

20 + 4y = 12

Subtracting 20 from both sides, we get 4y = -8.

Dividing both sides by 4, we find that y = -2.

Therefore, the solution to the system of equations is x = 4 and y = -2.

what is 32 percent of 60

Answers

19.2 is the answer. Hope this helps

The Smiths plan to recarpet their family room, which measures 15 ft. by 20 ft. How many square yards of carpet are needed?

Answers

1 ft = 1/3 yards

Area = width x length

w= 15 x 1/3 = 5
l = 20 x 1/3 = 6 2/3

Area = 5 x 6 2/3
33 1/3 square yards

Answer: [tex]33\frac{1}{3}[/tex] square yards of carpet is needed.

Step-by-step explanation:

Given: The dimensions for the carpet is  15 ft. by 20 ft.

We know that area ( in square units ) of a rectangle is given by :-

[tex]Area=length\times width[/tex]

Therefore, area of the required carpet is given by :-

[tex]Area=20\times15=300\text{ square feet}[/tex]

We know that 1 feet =1/3 yard

Now,

[tex]300\text{ square feet}=300\times\frac{1}{3}\times\frac{1}{3}\\=\frac{100}{3} \text{square yards}=33\frac{1}{3}\text{ square yards}[/tex]

Hence, [tex]33\frac{1}{3}[/tex] square yards of carpet is needed.

The equation √7-x=x 5 has two possible solution.

Answers

Answer:

What is the extraneous solution of the equation? Answer: x= -9

What is the true solution of the equation? Answer: x= -2

This is the correct answer.

Hoped this helped!

The function p(t) represents the value of a new car t years after it was manufactured.



p(t)=24,525(0.94)^t



What does the value 0.94 represent in this situation?

The value of the car increases by 94% each year.

The value of the car decreases by 94% each year.

The value of the car is 0.94 times the value of the car the previous year.

The initial value of the car is 0.94.

Answers

Answer:

The value of the car is 0.94 times the value of the car the previous year.



What is the value of x? If necessary, round your answer to two decimal places.

Answers

The correct answer is that X = 20.78

Samuel drove 28 miles in 32 minutes. Beverly drove 42 miles in 48 minutes.

Are the ratios of miles to minutes for Samuel and Beverly proportional?

Answers

28 miles in 32 minutes. We need to find how far in 1 minute, so 32 divided by 32 gives us 1 minute. 28 divided by 32 gives 0.875 miles in a minute.

Apply to Beverly. 48 divided by 48 to give 1 minute. 42 divided by 48 is 0.875 miles in a minute.

The answer is yes, they are proportional.

Answer:

Yes. Ratios of miles to minutes for Samuel and Beverly are proportional

Step-by-step explanation:

Samuel's speed can be calculated as following:

[tex]28/32=0,875[/tex]

0,875 miles per minute.

On the other hand Beverly's speed can be calculated as following:

[tex]42/48=0,875[/tex]

0,875 miles per minute

If we convert the speed to mile per hour:

[tex]0,875*60=52,5[/tex]

It can be easily seen that both Samuel and Beverly drove at the same speed at 52,5 miles per hour.

name the property used in each equation. then find the value of n.
2.) 1·n=8
3.) 28·n=0
4.) 0+n=22
5.) 1/4·n=1

Answers

2. n = 8 (Identity property)
3. n = 0 (Zero Property)
4. n = 22 (Additive Identity Property)
5. n = 4 (Fractal property)

Marietta drives her tow truck 312 miles in 8 hours. What is her average speed in miles per hour? Be sure to include the equation for speed in your answer.

Answers

We know, Average speed = Distance traveled / Time Taken

We have, distance = 312 miles &
Time = 8 hours,

Substitute their values into the expression,

Savg = 312 / 8 = 39 miles/hour

So, the final average speed is 39 miles / hour

Hope this helps! 

The average speed in miles per hour is 39mi/hr

How to calculate Speed of a body

Speed is the ratio of distance with respect to time. The formula for calculating speed is expressed as:

Speed = Distance/Time

Given the following

Distance = 312 miles

Time = 8 hours

Substitute

Speed = 312/8

Speed = 39mi/hr

Hence the average speed in miles per hour is 39mi/hr

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Hillary wants to go on the latin club trip to italy it cost 2730 for the trip the trip is 30 weeks away and she wants to make equal weekly payments how much money altogether does hillary need to pay at the end of week eight

Answers

91.00 weekly
at the end of 8 weeks she will need $ 728.00 all together

What are the coordinates of the vertex for f(x) = 2x^2 + 4x + 9?

(−2, 4)
(−1, 7)
(1, 15)
(2, 9)

Answers

Looking at y = 2x^2 + 4x + 9, we see it is in the form y = ax^2 + bx + c where
a = 2
b = 4
c = 9
Plug these into h = -b/(2a) to get
h = -b/(2a)
h = -4/(2*2)
h = -1
Then plug this into the function to get
f(x) = 2x^2 + 4x + 9
f(-1) = 2(-1)^2 + 4(-1) + 9
f(-1) = 2(1) + 4(-1) + 9
f(-1) = 2-4+9
f(-1) = -2+9
f(-1) = 7
So the vertex is at (-1,7)

The increase in a person’s body temperature T(t), above 98.6ºF, can be modeled by the function T(t)=(4t)/(t^2 +1), where t represents time elapsed. What is the meaning of the horizontal asymptote for this function? The horizontal asymptote of y = 0 means that the person’s temperature will approach 98.6ºF as time elapses. The horizontal asymptote of y = 0 means that the person’s temperature will approach 0ºF as time elapses. The horizontal asymptote of y = 4 means that the person’s temperature will approach 102.6ºF as time elapses. The horizontal asymptote of y = 4 means that the person’s temperature will approach 4ºF as time elapses.

Answers

The person's body temperature will approach 98.6ºF as time lapses. Option A is correct.

How to calculate the horizontal asymptotes of a function?

A horizontal asymptote for a function is an imaginary line that is not part of the graph and lies along the x-axis of the graph either to the left or right.

The horizontal asymptote of the given function can be described as the nature of the function T(f) as t approaches infinity.

This is the point where the line y=0 which means that the person's body temperature will approach 0ºF above 98.6ºF as t goes to infinity.

You can learn more about asymptotes here: https://brainly.com/question/4138300

write 158/4 as a mixed number in simplest terms. Thank you.

Answers

It would be: 158/4 = 39.5 = 39 1/2

So, your final answer is 39 1/2

Hope this helps!

Final answer:

The mixed number of 158/4 simplified is 39 1/2. A proportion comparing the ratios 1/48 and w/16 is solved by cross-multiplication resulting in w = 1/3 as the solution.

Explanation:

To write 158/4 as a mixed number in simplest terms, we first divide 158 by 4. When we do this division, 4 goes into 158, 39 times completely, since 4 * 39 = 156, and we get a remainder of 2. Therefore, the mixed number form of 158/4 is 39 2/4. To simplify this fraction further, we divide the numerator and the denominator by their greatest common divisor, which in this case is 2. Simplifying 2/4 by dividing both the numerator and denominator by 2, we get 1/2. Hence, the mixed number in its simplest terms is 39 1/2.

To set up a proportion using the given ratios, we start with the ratio 1/48 and set it equal to w/16, which can be represented as:

1/48 = w/16

When solving for w, we cross-multiply to get:

1 * 16 = 48 * w

Which simplifies to:

16 = 48w

Finally, to find the value of w, we divide both sides of the equation by 48, which gives us w = 16/48. Simplifying by dividing both numerator and denominator by the greatest common divisor, 16, we get:

w = 1/3

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