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3 years ago

Need help for the this question

Mathematics

1 answer:

const2013 [10]3 years ago

8 0

You out a 7 with a little two at the top in the box

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Let Z={a,c,{a,b}}. What is |Z|?

Lina20 [59]

$Z=\{a,c,\{a,b\}\}$

$\boxed{|Z|=3}$ (treat $\{a,b\}$ as one element of $Z$ )

The power set of $Z$ is

$\boxed{2^Z=\bigg\{\{\},\{a\},\{c\},\big\{\{a,b\}\big\},\{a,c\},\big\{a,\{a,b\}\big\},\big\{c,\{a,b\}\big\},\big\{a,c,\{a,b\}\big\}\bigg\}}$

1. $\{a,c\}\subseteq Z$ is true because both $a\in Z$ and $c\in Z$ .

2. $a\in Z$ is true.

3. $\{c\}\subseteq Z$ is true (same reason as part 1).

4. $\{c\}\in Z$ is false because $Z$ does not contain the set $\{c\}$ , rather just the element $c$ itself.

5. $b\in Z$ is false because the element $b$ on its own simply is not in $Z$ . That $b\in\{a,b\}$ does not mean $b\in Z$ , but that $b$ belongs to a subset of $Z$ .

6. $\{a,b\}\in Z$ is true.

6 0

4 years ago

Can someone please help me

Alex787 [66]

A.30
b.60
c.90
must be 180

4 0

3 years ago

Read 2 more answers

PLS HELP ME

eimsori [14]

Answer:

5.5

Step-by-step explanation:

2,3,3,4,5,7,8,8,8,10,10,12

The mean of this data is 7.5. So what you are trying to figure out is the mean between 2 and 7. Since that is 3 and 4 it would be 3.5. So 3.5 is the Q1. Now you have to figure out the mean between 8 and 12. That is 9. This is Q3. You have to subtract 9-3.5 and that is the interquartile range. So 5.5 is the answer. I hope that made sense.

6 0

3 years ago

There were 1372 million fewer barrels of crude oil produced in country A in 2009 than there were in country B. Find the number o

snow_lady [41]

Easy, the answer is 1,588 million barrels of oil produced in country B... just add 1372 to 216...

8 0

4 years ago

Please answer quickly! will give brainliest!

Y_Kistochka [10]

Answer:

12 cows and 5 chickens

8 0

3 years ago