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AveGali [126]
2 years ago
8

HELP PLEASE Which relation is a function of x? ​

Mathematics
1 answer:
lorasvet [3.4K]2 years ago
6 0

Answer:

ok i did one of these before it was the 2nd or 3rd one

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If x and y are two rational numbers such that x < y , then ______ is a rational number in between x and y.
stich3 [128]

Answer:

\dfrac{x+y}{2}

Step-by-step explanation:

Let first number be x and another number is y.

A rational number is a fraction that can be expressed in the form of x/y.

A rational number between x and y is given by :

R=\dfrac{x+y}{2}

So,

If x and y are two rational numbers such that x < y , then \dfrac{x+y}{2} is a rational number in between x and y.

3 0
2 years ago
Which is a reasonable estimate for 7473 - 2875
kozerog [31]

Answer: the answer is 4,598.

5 0
2 years ago
Virtual Nerd™: How Do You Use a Tree Diagram to Count the Number of Outcomes in a Sample Space?
kipiarov [429]

Answer:

We use tree diagram by connecting relevant samples

Step-by-step explanation:

thats all

8 0
3 years ago
The lifetime of a battery in a certain application is normally distributed with mean μ = 16 hours and standard deviation σ = 2 h
DaniilM [7]

Answer:

Probability that a battery will last more than 19 hours is 0.0668.

Step-by-step explanation:

We are given that the lifetime of a battery in a certain application is normally distributed with mean μ = 16 hours and standard deviation σ = 2 hours.

<em>Let X = lifetime of a battery in a certain application</em>

So, X ~ N(\mu=16,\sigma^{2} =2^{2})

The z-score probability distribution for normal distribution is given by;

               Z = \frac{  X -\mu}{\sigma}  ~ N(0,1)

where, \mu = mean lifetime = 16 hours

            \sigma = standard deviation = 2 hours

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X.

So, the probability that a battery will last more than 19 hours is given by = P(X > 19 hours)

  P(X > 19) = P( \frac{  X -\mu}{\sigma} > \frac{19-16}{2} ) = P(Z > 1.50) = 1 - P(Z \leq 1.50)

                                              = 1 - 0.9332 = 0.0668

<em>Now, in the z table the P(Z </em>\leq<em> x) or P(Z < x) is given. So, the above probability is calculated by looking at the value of x = 1.50 in the z table which has an area of 0.9332.</em>

Hence, the probability that a battery will last more than 19 hours is 0.0668.

5 0
3 years ago
The cost of sending an overnight package from Kansas City to Miami is $23.50 for a package weighing up to but not including 1
Dimas [21]

Answer:

For every pound that the package weight increases, the price of sending it increases by $3.80.

Step-by-step explanation:

The coefficient 3.80 multiplies the variable x (package weight), so if x is 1 pound the cost increase $3.80, if x is 2 pound the cost increase 2*3.80 = $7.6, and so on.  Generally speaking, for every pound that the package weight increases the cost increases by $3.80.

4 0
3 years ago
Read 2 more answers
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