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andre [41]
3 years ago
13

Help please. this is really hard for me to understand.

Mathematics
1 answer:
bogdanovich [222]3 years ago
8 0

Answer:

1. x = - 4, - 3

2. x = 9, - 1

3. x = - 1, 10

4. x = - 8, - 3

You might be interested in
(x2 + 10x + 21) - (x + 7)
rusak2 [61]

Answer:

11x+14

Step-by-step explanation:

(2x+10x+21)-x-7 = 12x+21-x-7 = 11x+14

3 0
3 years ago
A sports club has 84 members who learned baseball, and 42 of those members also learned basketball. There are 25 students who di
HACTEHA [7]

<em>The table that shows the relative frequency of data is in the below further explanation.</em>

\texttt{ }

<h3>Further explanation</h3>

A set is a clearly defined collection of objects.

To declare a set can be done in various ways such as:

  • With words or the nature of membership
  • With set notation
  • By registering its members
  • With Venn diagrams

\texttt{ }

Multiplying set A x B is by pairing each member of set A with each member of set B.

<u>Example:</u>

<em>A = {1, 2, 3}</em>

<em>B = {a, b}</em>

Then

A x B = {(1, a), (1, b), (2, a), (2, b), (3, a), (3, b)}

\texttt{ }

Union of set A and B ( A ∪ B ) is rewriting each member A and combined with each member B.

Intersection of set A and B ( A ∩ B ) is to find the members that are both in Set A and Set B.

<u>Example:</u>

<em>A = {1, 2, 3, 4}</em>

<em>B = {3, 4, 5}</em>

A ∪ B = {1, 2, 3, 4, 5}

A ∩ B = {3, 4}

Let us now tackle the problem!

\texttt{ }

<em>A sports club has 84 members who learned baseball, and 42 of those members also learned basketball.</em>

\left[\begin{array}{ccc}&Play Baseball&Don't Play Baseball\\Play Basketball&\boxed{42}& \\Don't Play Basketball& & \end{array}\right]

\texttt{ }

Number of members who learned baseball but did not learn basketball will be ( 84 - 42 ) = 42 members

\left[\begin{array}{ccc}&Play Baseball&Don't Play Baseball\\Play Basketball&42& \\Don't Play Basketball&\boxed{42}& \end{array}\right]

\texttt{ }

<em>There are 25 students who did not learn baseball but learned basketball</em>

\left[\begin{array}{ccc}&Play Baseball&Don't Play Baseball\\Play Basketball&42&\boxed{25} \\Don't Play Basketball&42& \end{array}\right]

\texttt{ }

<em>8 students did not learn either baseball or basketball</em>

\left[\begin{array}{ccc}&Play Baseball&Don't Play Baseball\\Play Basketball&42&25 \\Don't Play Basketball&42&\boxed{8} \end{array}\right]

\texttt{ }

<em>Total Number of Students = 42 + 42 + 25 + 8 = 117</em>

\texttt{ }

Table of relative frequency

\left[\begin{array}{ccc}&Play Baseball&Don't Play Baseball\\Play Basketball&\boxed{\frac{42}{117}}&\boxed{\frac{25}{117}} \\Don't Play Basketball&\boxed{\frac{42}{117}}&\boxed{\frac{8}{117}} \end{array}\right]

\texttt{ }

<h3>Learn more</h3>
  • Mean , Median and Mode : brainly.com/question/2689808
  • Centers and Variability : brainly.com/question/3792854
  • Subsets of Set : brainly.com/question/2000547

<h3>Answer details</h3>

Grade: High School

Subject: Mathematics

Chapter: Sets

Keywords: Sets , Venn , Diagram , Intersection , Union , Mean , Median , Mode

8 0
3 years ago
Read 2 more answers
What is the three hundred and twenty six to the nearest ten
uysha [10]

Hi there!  

»»————- ★ ————-««

I believe your answer is:  

330

»»————- ★ ————-««  

Here’s why:  

⸻⸻⸻⸻

We are rounding the number 326 to the nearest tens.

The '2' is in the tens place, and the '6' is to the right of the digit.

Since the '6' is greater than or equal to 5, then we would round up.

326 ≈ 330

⸻⸻⸻⸻

»»————- ★ ————-««  

Hope this helps you. I apologize if it’s incorrect.  

8 0
3 years ago
Read 2 more answers
60% off $69.80. what is the sale price?
IrinaK [193]

Answer:

Step-by-step explanation:

60 percent of $69.80 = $41.88

3 0
2 years ago
Read 2 more answers
what is the probability of seeing a sample mean for 21 observations less or equal to the sample mean that we observed
kramer

Answer:

P(x \le 21) = 0.69146

Step-by-step explanation:

The missing parameters are:

n = 64 --- population

\mu = 20 --- population mean

\sigma = 16 -- population standard deviation

Required

P(x \le 21)

First, calculate the sample standard deviation

\sigma_x = \frac{\sigma}{\sqrt n}

\sigma_x = \frac{16}{\sqrt {64}}

\sigma_x = \frac{16}{8}

\sigma_x = 2

Next, calculate the sample mean \bar_x

\bar x = \mu

So:

\bar x = 20

So, we have:

\sigma_x = 2

\bar x = 20

x = 21

Calculate the z score

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

x = \frac{21 - 20}{2}

x = \frac{1}{2}

x = 0.50

So, we have:

P(x \le 21) = P(z \le 0.50)

From the z table

P(z \le 0.50) = 0.69146

So:

P(x \le 21) = 0.69146

4 0
3 years ago
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