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pashok25 [27]
3 years ago
14

Which expression can be used to model the phrase "the sum of three and a number"?

Mathematics
1 answer:
NeX [460]3 years ago
3 0
The sum of three and a number is 3+x
You might be interested in
Is quadrilateral UVWX a parallelogram? Why or why not?
Neko [114]

Answer:

C

Step-by-step explanation:

Slope of UV = 0 = Slope of XW

So UV is parallel to XW.

Slope of UX = [6-(-4)]/[-7-(-3)] = -5/2

Slope of VW = [6-(-4)]/(0-4) = -5/2

Slope of UX = Slope of VW i.e. UX is parallel to VW.

It is a parallelogram because opposite sides are parallel.

4 0
3 years ago
It has been estimated that 40% of marriages end in divorce. If you randomly select 9 recently married couples what is the probab
Serga [27]

Answer:

Step-by-step explanation:

Hello!

In this example you are interested to know how many matrimonies and up in divorce.

The study variable is X: number of marriages that ended up in divorce in a sample of nine.

This variable is a discrete variable and a quick check will tell you if it follows the binomial criteria, if it does, then the variable will have binomial distribution:

Binomial criteria:

1. The number of observation of the trial is fixed (n = 9)

2. Each observation in the trial is independent, this means that none of the trials will affect the probability of the next trial.

3. The probability of success in the same from one trial to another (the "success" of the trial is that the matrimony ended up in divorce and it's estimated probability is p=0.40

So X≈ Bi (n;ρ)

You have to calculate the probability that at least one of the marriages end in divorce, this is that "one or more" of the marriages end in divorce, symbolically:

P(X≥1)

This expression includes the probabilities P(X=1), P(X=2), P(X=3), P(X=4), P(X=5), P(X=6), P(X=7), P(X=8), P(X=9).

One way to calculate this is by applying the formula for calculating point probabilities under the binomial distribution P(X)= \frac{n!}{(n-X)!X1}*(p^X)*(q^n-X) nine times and then add them or you can use a table of the binomial distribution. These tables show cumulative probabilities for many distributions, P(X≤x₀)

To reach the probability value using the table you have to do the following:

P(X≥1)= 1 - P(X<1)

One is the max cumulative probability, so you have to subtract from it everything that isn't included in the expression, the only probability that is "left out" from P(X≥1) is P(X=0), in the table you have to look for the probability of P(X≤0)= 0.0101, then you calculate the probability as follow:

P(X≥1)= 1 - P(X<1)= 1 - P(X≤0)= 1 - 0.0101= 0.9899

I hope this helps!

6 0
3 years ago
Which of the following numbers is not part of the solution x ≤ -2
Ainat [17]

Answer:

D.

Step-by-step explanation:

In order for it to be the solution, it must be less than or equal to -2. D (-1.76) is bigger than -2, which means it is not a part of the solution.

8 0
3 years ago
Read 2 more answers
What is 2/3 - 5 9th in fractions
Temka [501]

Answer:

-4.33333333333

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
The computer won’t accept my answers and my teacher doesn’t accept late work
LiRa [457]
Email the teacher and see if she can check it at a later time
7 0
3 years ago
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