Help please!!! im begging

Mathematics

1 answer:

lakkis [162]2 years ago

4 0

The answer is 30.5 because to find the perimeter you have to add up all the sides and the top and 2 sides are equal so u already know that so 6+6+6+12.5= 30.5

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How to solve equations

stich3 [128]

Here are some things you should know when solving algebraic equations.

If you add an expression to both sides of an equation, the resulting equation will have the same solution set as the original equation. In other words, they will be equivalent. This is true for all operations. As long both sides are treated the same, the equation will stay balanced.

You will also need to know how to combine like terms. But what are like terms to begin with? Like terms are defined as two terms having the same variable(s) (or lack thereof) and are raised to the same power. In mathematics, something raised to the first power stays the same. So, 5x and 10x are like terms because they both have the same variable and are raised to the first power. You don’t see the exponents because it doesn’t change the value of the terms.

To combine like terms, simplify add the coefficients and keep the common variable(s) and exponent.

The distributive property is another important rule you will need to understand.

The distributive property is used mostly for simplifying parentheses in expressions/equations.

For example, how would you get rid of the parentheses here?

6(x + 1)

If there wasn’t an unknown in between the parentheses, you could just add then multiply. That is what the distributive property solves.
The distributive property states that a(b + c) = ab + ac
So, now we can simplify our expression.

6(x + 1) = 6x + 6

6 0

4 years ago

A social network provides a variety of statistics on its website that detail the growth and popularity of the site. On average,

Reika [66]

Answer:

The probability is 0.3446.

Step-by-step explanation:

We have here percentages that are normally distributed. In this case, we are talking about a group of people from 18 to 34-years-old "that check their social network profiles before getting out of bed in the morning".

The mean is 21 percent of them have this behavior (on average). The standard deviation is five percent. If the data is normally distributed, it implies that for 23 percent of them, there must be more cases for those that check their network profiles (for a cumulative probability).

The question is asking about the probability that the percent is at least 23. Since the mean is 21 percent, for normally distributed data, there is at least a probability of 0.50 that these people check their social network at this percentage, that is, 50% of the cases corresponds to that 21 percent of this people. What about 23 percent of people?

To find the probability in the question, we need to "transform" this raw score of 23 to a z-score to consult the cumulative standard normal table. We have to remember that with the standard normal distribution, we can obtain the probabilities associated with any normally distributed data and that the z-scores give us the distance from the mean in standard deviation units.

The formula for z-scores is as follows:

$\\ z = \frac{x - \mu}{\sigma}$

Where

$\\ x\;is\;the\;raw\;score$ .

$\\ \mu\;is\;the\;population\;mean$ .

$\\ \sigma\;is\;the\;population\;standard\;deviation$ .

The raw score here is 23 percent.

Then

$\\ z = \frac{23 - 21}{5}$

$\\ z =0.40$

The probability for a z = 0.40, using the cumulative standard normal table, we have that $\\ P(x$ (rounding to four decimal places).

So, there is a cumulative probability of 0.6554 for cases below that 23 percent (cumulative probability). However, for cases above 23 or at least 23 percent (or it could be more than 23), the corresponding probability is of P(x>23) = P(z>0.40) = 1 - 0.6554 = 0.3446 (or 34.46%) (i.e., the complement) that at least 23 percent of 18 to 34-year-olds "check the social network before getting out of bed in the morning".

See the graph below.