Does Brainly help with Geometry?
2 answers:
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Answer:
y = 2(x - 2)² + 3 vertex form
y = 2x² - 8x + 11 standard form
Step-by-step explanation:
Vertex form
y = a(x - h)² + k
(h, k) = (2, 3)
y = a(x - 2)² + 3
To find "a" plug in the y-intercept (0, 11)
11 = a(-2)² + 3
11 = 4a + 3
Subtract 3 from both sides
8 = 4a
a = 2
y = 2(x - 2)² + 3
Expand
y = 2(x² - 4x + 4) + 3
y = 2x² - 8x + 11
Answer:
There were 440 Standard version of songs downloaded in Web music store.
Step-by-step explanation:
Given,
Total number of songs downloaded = 1310
Total size of the downloaded songs = 4752 MB
Size of standard version of song = 2.1 MB
Size of high quality version of song = 4.4 MB
Solution,
Let the number of standard version of song be 'x'.
And also let the number of high quality version of song be 'y'.
Now, total number of songs is the sum of total number of standard version of song and total number of high quality version of song.
On framing the above sentence in equation form, we get;
Now, Total size of the downloaded songs is the sum of total number of standard version of song multiplied with size of standard version of song and total number of high quality version of song multiplied with size of high quality version of song.
On framing the above sentence in equation form, we get;
Multiplying with 10 on both side, we get;
Now multiplying equation 1 by 21, we get;
Now subtract equation 3 from equation 2, we get;
On substituting the value of y in equation 1, we get the value of x;
Hence There were 440 Standard version of songs downloaded in Web music store.