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Serga [27]
3 years ago
9

Please help!!! Also do not put a link as your answer. Whoever answers this first with work shown will get Brainliest, and 30 poi

nts.
What is the equation of a parabola with (-3,3) as the focus, and y=5 as the directrix?
Remember no link! :)
Mathematics
1 answer:
Maurinko [17]3 years ago
3 0

Answer y = 1/4 (x+3)^2 + 4

Step-by-step explanation:

If the focus is (-3, 3) and the directrix is y=5, the vertex is at (-3, 4). a = 1/4p, p=1, a=1/4. (h,k) is the vertex.

y=a(x-h)^2 +k

y=1/4(x+3)^2+4

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schepotkina [342]

1= 136 degrees

2= 44 degrees

3= 136 degrees

5 0
3 years ago
Read 2 more answers
Consider the probability that fewer than 26 out of 107 cell phone calls will be disconnected. Assume the probability that a give
anyanavicka [17]

Answer:

We assume the condition of independence satisifed.

We need to check the following conditions in order to use the normal approximation.

np=107*0.98=104.86 \geq 10

n(1-p)=107*(1-0.98)=2.14 < 10

So we see that we satisfy the first condition, but the second no so then we can't apply the approximation for this case, since we need both conditions at the same time in order to use the normal approximation.

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Let X the random variable of interest, on this case we now that:

X \sim Binom(n=107, p=0.98)

The probability mass function for the Binomial distribution is given as:

P(X)=(nCx)(p)^x (1-p)^{n-x}

Where (nCx) means combinatory and it's given by this formula:

nCx=\frac{n!}{(n-x)! x!}

Solution to the problem

We assume the condition of independence satisifed.

We need to check the following conditions in order to use the normal approximation.

np=107*0.98=104.86 \geq 10

n(1-p)=107*(1-0.98)=2.14 < 10

So we see that we satisfy the first condition, but the second no so then we can't apply the approximation for this case, since we need both conditions at the same time in order to use the normal approximation.

4 0
3 years ago
#4 a and b and #5 please
Cloud [144]
The intrusions are there on the paper read it 3 times
6 0
3 years ago
2+2+2×644×300? I known if u use a. Caculatuer u cheat and lose. I cant give the answer tell its rigth dont copy. Someone eleses
Solnce55 [7]
2+2+2x644x300
First, you need multiple,
2+2+1288x300
=2+2+386400
Then add together~
=386404
That's your answer lovely~

5 0
3 years ago
zales bought a tea set for $1400. zales wants to mark up the set 55% of the selling price. the selling price of the tea set shou
Nimfa-mama [501]

Answer:

The selling price of the tea set should be: The selling price of the tea set is $2170

$1400 x . 55 = $770.

4 0
3 years ago
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