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Aleksandr [31]
3 years ago
14

Which of the following are quadratic functions? Check all that apply.

Mathematics
2 answers:
Elanso [62]3 years ago
8 0
B and c, anything with an x^2 term is a quadratic.
ddd [48]3 years ago
7 0

Answer: B and c

Step-by-step explanation: B and c

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The number of hours required to do a job varies inversely as the number of people working. It takes 8 hours for 4 people to pain
dezoksy [38]

Answer: it will take 5 people 6.4 hours to do the work.

Step-by-step explanation:

The number of hours required to do a job varies inversely as the number of people working. Let h represent the number of hours required to do the job. Let p represent the number of people working. Therefore,

h is inversely proportional to p

Introducing a constant of variation, k, it means that

h = k/p

It takes 8 hours for 4 people to paint the inside of a house. Therefore

8 = k/4

k = 8×4 = 32

The formula becomes

h = 32/p

To determine how many hours it will take 5 people to do the work, we will substitute p = 5 into the formula. It becomes

h = 32/5 = 6.4 hours

7 0
3 years ago
Find the equation of the line
wel
The slope is -1/4 and the y intercept it -6
3 0
2 years ago
Please help me, I don't understands this question
Rudik [331]
It would be none because the same would be the reciprocal which would be (-7, -8.75)
8 0
3 years ago
How many do i put ? <br> middle school-
Lorico [155]

Answer:

1 4/5

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Diagram below shows the curve of a quadratic function
uranmaximum [27]

Answer:

q = -8, k = 2.

r = -6.

Step-by-step explanation:

f(x) = (x - p)^2 + q

This is the vertex form of a quadratic where the vertex is at the point (p, q).

Now the x intercepts are at -6 and 2 and the curve is symmetrical about the line x = p.

The value of p is the midpoint of  -6 and 2 which is (-6+2) / 2 = -2.

So we have:

f(x) = 1/2(x - -2)^2 + q

f(x) = 1/2(x + 2)^2 + q

Now the graph passes through the point (2, 0) , where it intersects the x axis, therefore, substituting x = 2 and f(x) = 0:

0 = 1/2(2 + 2)^2 + q

0 = 1/2*16 + q

0 = 8 + q

q = -8.

Now convert this to standard form to find k:

f(x) = 1/2(x + 2)^2 - 8

f(x) = 1/2(x^2 + 4x + 4) - 8

f(x) = 1/2x^2 + 2x + 2 - 8

f(x) = 1/2x^2 + 2x - 6

So k = 2.

The  r  is the y coordinate when x = 0.

so r = 1/2(0+2)^2 - 8

=  -6.

3 0
3 years ago
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