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arlik [135]
3 years ago
11

State the value of the discriminant for y =

2+9x-3" alt="5x^2+9x-3" align="absmiddle" class="latex-formula">
Mathematics
1 answer:
Nostrana [21]3 years ago
3 0

Answer:

141, meaning that there will be two real solutions

Step-by-step explanation:

The discriminant of a quadratic is b^2-4ac, which in this case is:

9^2-4(5)(-3)=81+60=141

Since the discriminant is positive and not zero, there will be two real solutions to this equation. This is because when the discriminant is negative, and you take the square root of it, you get a negative number. If you take the square root of 0, you get 0, which means that there will only be one solution to the equation.

Hope this helps!

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Can someone help me please????
liraira [26]
Let X be the random variable denoting the number of successful throws.

Here X~ Binomial Distribution with n = 5 and p = 0.80.

the probability of her missing 3 (or more) free throws out of 5

= P ( X ≤ 2)

= P (X= 0) + P(X= 1) + P(X= 2)

=0.00032 + 0.0064 + 0.0512
<span>
= 0.05792

I hope my answer has come to your help. God bless and have a nice day ahead!
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7 0
3 years ago
Read 2 more answers
Paul bought 2.25 meters of wood to make 5 shelves of equal length . What is the length of each shelf ? show your work on a picec
LiRa [457]

Answer:

Length of each shelf is 0.45 meters

Step-by-step explanation:

Given

Total\ Length = 2.25\ meters

Shelves = 5

Required

Determine the length of each shelf

This is calculated by dividing the total length by number of shelves as thus:

Length = Total\ Length/Number\ of\ Shelf

Length = 2.25m /5

Length = 0.45m

Hence;

<em>Length of each shelf is 0.45 meters</em>

3 0
3 years ago
Read 2 more answers
This table represents a proportional relationship. Use the table to identify the constant of proportionality between the ratio o
VARVARA [1.3K]

Answer:

It would be 12...

Step-by-step explanation:

6 0
3 years ago
Suppose that the probability that a person is killed by lightning, in a year is, independently of other people, 1/(500 million).
Katen [24]

Answer:

a) P(X \geq 3) = 1- P(X

The individual pprobabilities are:

P(X=0)=(300000000C0)(\frac{1}{500000000})^3 (1-\frac{1}{500000000})^{300000000-0}=0.548812

P(X=1)=(300000000C0)(\frac{1}{500000000})^3 (1-\frac{1}{500000000})^{300000000-0}=0.329287

P(X=2)=(300000000C0)(\frac{1}{500000000})^3 (1-\frac{1}{500000000})^{300000000-0}=0.098786

And if we replace we got:

P(X \geq 3) = 1- [0.548812+0.329287+0.098786]=0.023115

b) P(X \geq 3) = 1- P(X

And we can calculate this with the following excel formula:

=1-BINOM.DIST(2;300000000;(1/500000000);TRUE)

And we got:

P(X\geq 3) = 0.023115

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".

Solution to the problem

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

X \sim Binom(n=300000000, p=\frac{1}{500000000})

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!}

(a) Write down the exact expression for the probability P(3 or more people will be killed by lightning in the U.S. next year). Evaluate this expression to 6 decimal places.

For this case we want this probability, we are going to use the complement rule:

P(X \geq 3) = 1- P(X

The individual probabilities are:

P(X=0)=(300000000C0)(\frac{1}{500000000})^3 (1-\frac{1}{500000000})^{300000000-0}=0.548812

P(X=1)=(300000000C0)(\frac{1}{500000000})^3 (1-\frac{1}{500000000})^{300000000-0}=0.329287

P(X=2)=(300000000C0)(\frac{1}{500000000})^3 (1-\frac{1}{500000000})^{300000000-0}=0.098786

And if we replace we got:

P(X \geq 3) = 1- [0.548812+0.329287+0.098786]=0.023115

(b) Write down a relevant approximate expression for the probability from (a). Justify briefly the approximation. Evaluate this expression to 6 decimal places.

For this case we want this probability, we are going to use the complement rule:

P(X \geq 3) = 1- P(X

And we can calculate this with the following excel formula:

=1-BINOM.DIST(2;300000000;(1/500000000);TRUE)

And we got:

P(X\geq 3) = 0.023115

7 0
3 years ago
Which expression is not equivalent to 3x - 2
Delvig [45]

Answer:

The answer is Option one.

Step-by-step explanation:

X+x= 2x and -1 - 1 = -2

7 0
3 years ago
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