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N76 [4]
3 years ago
15

Use the Distributive Property to simplify the expression 7(x−4)7(x−4).

Mathematics
2 answers:
LuckyWell [14K]3 years ago
8 0
It seems like you want to simplify 7(x-4)

If so, then multiply the outer 7 by each term inside (x and -4)
7 times x = 7x
7 times -4 = -28
Add up the results: 7x+(-28) = 7x-28

Therefore, 7(x-4) turns into 7x-28
Schach [20]3 years ago
3 0
7x - 28 = 7x-28 
isolate the variable 
7x-7x= -28+28 
the answer would be zero 
I may be wrong 
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Rodrigo is organizing a banquet. He rents a hall for a fee of $225. The catered dinner is $25 per person. He hires a deejay who
Aleks [24]
Hello there! An equation that can be used to find the total cost of the banquet is this:

225 + 50h + 25p = c

This is because "c" represents the total cost of everything, "h" represents hours, and "p" represents people. The $225 paid to rent a hall is a one-time price and does not go up. $50 is paid per hour to the DJ, and $25 is the amount per person for dinner.
8 0
4 years ago
A Geiger counter counts the number of alpha particles from radioactive material. Over a long period of time, an average of 14 pa
UkoKoshka [18]

Answer:

0.2081 = 20.81% probability that at least one particle arrives in a particular one second period.

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

In which

x is the number of sucesses

e = 2.71828 is the Euler number

\mu is the mean in the given interval.

Over a long period of time, an average of 14 particles per minute occurs. Assume the arrival of particles at the counter follows a Poisson distribution. Find the probability that at least one particle arrives in a particular one second period.

Each minute has 60 seconds, so \mu = \frac{14}{60} = 0.2333

Either no particle arrives, or at least one does. The sum of the probabilities of these events is decimal 1. So

P(X = 0) + P(X \geq 1) = 1

We want P(X \geq 1). So

P(X \geq 1) = 1 - P(X = 0)

In which

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

P(X = 0) = \frac{e^{-0.2333}*(0.2333)^{0}}{(0)!} = 0.7919

P(X \geq 1) = 1 - P(X = 0) = 1 - 0.7919 = 0.2081

0.2081 = 20.81% probability that at least one particle arrives in a particular one second period.

8 0
4 years ago
6x-4y=-15 and x-4y=1
Harlamova29_29 [7]

Answer:

The solution to the given system of equations is

(-\frac{16}{5},-\frac{21}{20})

Step-by-step explanation:

Given system of equation are

6x-4y=-15\hfill (1)

x-4y=1\hfill (2)

To solve equation by using elimination method

Now subtracting equations (1) and (2)

6x-4y=-15

x-4y=1

_________________

5x=-16

x=-\frac{16}{5}

Substitute x=-\frac{16}{5}  in equation (1)

6(-\frac{16}{5})-4y=-15

-\frac{96}{5}-4y=-15

-4y=-15+\frac{96}{5}

-4y=\frac{21}{5}

y=-\frac{21}{20}

Therefore the solution is

(-\frac{16}{5},-\frac{21}{20})

4 0
3 years ago
Which table represents a nonlinear function?
Softa [21]

Answer:

The table that represents the nonlinear function is the one where the x-values are -7, -5 and 0 and the y-values are -3, 0 and 3.

Step-by-step explanation:

In order for a table to represent a linear function, there needs to be a consistent change in y-values divided by the change in x-values.  For example, for any two points on the table when we subtract two y-values and divide by the number we get when we subtract two x-values, this change should be represented throughout the table.  So, in the case of the other three tables, when we choose two points from the table, such as (-5, 7) and (-2,6) and put them into an equation (y2-y1/x2-x1) or (6-7)/(-2-(-5)) we would get a change of -1/3.  However, when we apply this concept to the table where x-values are -7,-5, and 0, we see that the change is not consistent between points, so the function must be nonlinear.

5 0
4 years ago
I have this math problem that I need to do, can you explain it to me please? Divide 28 cans of soda into two groups so the ratio
Readme [11.4K]

Answer:

12 and 16

Step-by-step explanation:

The ratio between the groups is 3:4, so the fractions are 3/7 and 4/7.

3/7 (28) = 12

4/7 (28) = 16

Check your answer: 12 + 16 = 28, and 12/16 = 3/4.

7 0
4 years ago
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