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musickatia [10]
2 years ago
14

Help please!

Mathematics
2 answers:
oksian1 [2.3K]2 years ago
8 0

Answer:

y= -4x^2 + 15x - 14

Step-by-step explanation:

Anna71 [15]2 years ago
4 0

Answer:

y= -4x^2 + 15x - 14

Step-by-step explanation:

A parabola is always in the form y = ax^2 + bx + c.

Substitute each point to produce different equations:

-14 = 0a + 0b + c = c

so c = -14

-3 = a1^2 + b1 + c = a + b - 14

so a + b = 11

0 = a2^2 + b2 + c = 4a + 2b -14 = 0

so 4a + 2b = 14

if we double a + b = 11 we get 2a + 2b = 22

Subtract this from 4a + 2b = 14 and we get 2a = -8 so a= -4 and b = 11 - a = 15

We don't need to use the (3,5) points as we have all the information we need.

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A literature professor decides to give a 10-questiontrue-false quiz to determine who has read an as-signed novel. She wants to c
Darya [45]

Answer:

The teacher should set the score 7 as the lowest passing grade.

Step-by-step explanation:

Let <em>X</em> = number of correct guesses.

All the questions are of true-false format.

The probability of getting a correct answer is, <em>p</em> = 0.50.

The total number of questions is, <em>n</em> = 10.

The random variable <em>X</em> follows a Binomial distribution with parameters <em>n</em> = 10 and <em>p </em>= 0.50.

The probability mass function of <em>X</em> is:

P(X=x)={10\chose x}0.50^{x}(1-0.50)^{10-x};\ x=0,1,2,3...

Now the teaches chose the grading scheme such that the probability of passing a student who guesses on every question is less than 0.05.

Then the probability of failing such a students is at least 1 - 0.05 = 0.95.

Compute the probability distribution of <em>X</em>.

Consider the probability distribution attached below.

The value of <em>x</em> for which P (X ≤ x) is at least 0.95 is, <em>x</em> = 7.

So the teacher should set the score 7 as the lowest passing grade.

7 0
2 years ago
94 1/4 divided by 7 1/4
Lerok [7]
The answer is 13 :)))
6 0
2 years ago
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There are 5280 feet in 1 mile. how many feet are in 3.5 miles?
worty [1.4K]

Answer:

18,480

Step-by-step explanation:


5 0
2 years ago
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If you answer this I will mark you brainliest
Temka [501]

Answer:

Here is the ans..hope it helps:)

8 0
1 year ago
13 points so please help meee with a and b!
yawa3891 [41]

Answer:

(a)

$24.10,

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(b)

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Step-by-step explanation:

4 0
2 years ago
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