1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marina CMI [18]
2 years ago
11

8. The graph of f(x) = 2x² - 5x is shown. Amanda

Mathematics
1 answer:
snow_lady [41]2 years ago
5 0

Answer: Amanda is not correct

The vertex is at (1.25, -3.125)

=========================================================

Reason:

The x intercepts are 0 and 2.5

This is where the graph crosses the x axis. If we plugged in either x = 0 or x = 2.5, then we'd get f(x) = 0.

Find the midpoint of those values mentioned. Add them up, and divide by 2 to get the midpoint to be (0+2.5)/2 = 1.25

This is the x coordinate of the vertex.

Then plug that into the function to find the corresponding y coordinate of the vertex.

f(x) = 2x^2 - 5x

f(1.25) = 2(1.25)^2 - 5(1.25)

f(1.25) = -3.125

The vertex is located at (1.25, -3.125)

Amanda's x coordinate is correct, but the y coordinate isn't. Though her y coordinate isn't too far off.

I think I can see why she went with y = -3 since the lowest part of the graph is around this area. However, the lowest part of the parabola dips a tiny bit below y = -3. This is why it's better to use the equation rather than solely rely on the graph alone.

You might be interested in
Can someone help I’m in a bit of a pickle here
bagirrra123 [75]
Morgan earns more money per hour on saturday bc 63/6 = 10.5 and that’s more than 9.5 so
6 0
1 year ago
Read 2 more answers
Raychel drove to the mountains last week there was heavy traffic on the way there and on the trip took 12 hours when Raychel dro
nevsk [136]
Suppose that this person drives at r mph going to the mountains, and gets there in 12 hours.  Returning, this person drives at (r+20) mph and gets home in 8 hours.  We don't know the distance yet, but can solve for the initial speed, r, by setting

d = 12r = (r+20)(8).  Solving for r, r=40 mph (going) and (40+20)mph = 60 mph (returning.  Since d=12 r, d = (12 hrs)(40 mph) = 480 miles (answer).
4 0
3 years ago
Answer to 3,4,5,6,7,8,9,10,11,12 !!
sineoko [7]
3. i=129; j=112
4.k=90;l=116;m=64;n=86
5.o=13;p=78;q=91
6.a=120;b=60;c=140
Can't see #7
You did 8 I believe
9.v=39;w=59;x=121
10.y=59;z=93
11.a=42;b=48;c=132
12.a=60;b=50;c=80;d=100
8 0
3 years ago
PLZ EXPLAIN HOW TO DO THIS
Hitman42 [59]
Hello! Sorry, this took a minute. 

All of the x's are on the same line, and they are equal to 180 degrees. 

2x+x+3x+x=180 

A straight line equals 180. 

Combine like terms. 

7x=180

Divide both sides by 7. 

25.714... round to 25.7

Now, plug that into the angle that is vertical to 2y. (3x)

3(25.7)= 77.1

So, 3x= 77.1 and 2y= 77.1

Plug that in. 

2y=77.1

Divide both sides by 2. 

y=38.55

Round that up to 38.6. 

"D" is the answer.

I hope this helps!
~kaikers
3 0
3 years ago
The median of five consecutive even numbers is 44. What is the largest of the five numbers?
tankabanditka [31]
Where are the options?
7 0
3 years ago
Other questions:
  • Mrs. Reyes asked 3 girls and 4 boys to help with a project. She had each student make 8 paper airplanes. ​
    8·1 answer
  • Maani lai<br>1.8x = 4.68​
    10·1 answer
  • Rosa thinks of a number. She rounds it to the nearest thousand and gets 35,000. When rounded to the nearest hundred, the rounded
    15·1 answer
  • A milligram is what fraction of a kilogram
    14·1 answer
  • A wooden board is leaning against a building. The base of the board is 4 feet from the base of the building, and the base of the
    11·1 answer
  • You have a coin bank in the shape of a cylinder. It has a radius of 2 inches and a height of 6 inches. What is the surface area
    5·1 answer
  • Someone please help
    10·1 answer
  • Help pls its too hard
    13·1 answer
  • Suppose that the total cost of flatiron TVs is given by the function TC(Q) = 500Q + 300 dollars, where Q is the number of TVs pr
    8·1 answer
  • Find each angle in radians without using a calculator need some help with it, thanks!
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!