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Oksana_A [137]
2 years ago
6

Which of the following equations have no solutions? Choose all answers that apply: ​

Mathematics
1 answer:
Marianna [84]2 years ago
3 0

Answer:

All

Step-by-step explanation:

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The table shows information about the numbers of hours 30 children spent on their tablets one evening. a) find the class interva
Bogdan [553]

Answer:

a) 20<h≤30.

b) 26.17 hrs

Step-by-step explanation:

The missing table is shown in attachment.

Part a)

We need to find the class interval that contains the median.

The total frequency is

\sum \: f = 30

The median class corresponds to half

\frac{1}{2}  \sum \: f ^{th}  -  -  - value

That is the 15th value.

We start adding the frequency from the top obtain the least cumulative frequency greater or equal to 15.

2+8+9=19

This corresponds to the class interval 20<h≤30.

Adding from the bottom also gives the same result.

Therefore the median class is 20<h≤30.

b) Since this is a grouped data we use the midpoint to represent the class.

The median is given by :

\frac{\sum \: fx}{ \sum\: f}

=  \frac{5 \times 3 + 15\times 8 + 25 \times 9 + 35 \times 7 + 45 \times 4}{30}

=  \frac{785}{30}

= 26.17

8 0
3 years ago
Read 2 more answers
if angle A and angle B are supplementary, and angle A and angle C are supplementary. What conclusion is valid
Fantom [35]

Answer:

no angle c is not supplementary

Step-by-step explanation:

 

Angle A and angle B are supplementary

 

A+B=180°   Equation 1

 

The measure of angle B is equal to four times the complement of angle A

 

The complement of angle A=90°-A

 

B=4(90°-A)  

 

B=360°-4A

 

Substitute the value of B in equation 1

 

A+360°-4A=180°

 

-3A=-180°

 

A=60°

 

The measure of angle A=60°

 

B=360°-4A=360°-4(60°)=120°

 

The measure of angle B=120°

6 0
3 years ago
Read 2 more answers
Please help me on number one I will mark you as the best answer
Fiesta28 [93]

Answer:

-4n - 40 > -120

<=> -4n > -80

<=> 4n < 80

<=> n < 20

=> Option B is correct.

q/(-7) + 1 > 5

<=> q/(-7) > 4

<=> q < 4 x (-7)

<=> q < -28

=> Option C is correct.

Hope this helps!

:)

4 0
3 years ago
Find x (btw if you answer randomly to just get point imma report ur acc)​
seropon [69]

Answer:

x = 3

Step-by-step explanation:

..........................

3 0
3 years ago
Read 2 more answers
True or False: (2,3) is a solution for both of the following equations:<br> y=2x+1 and y-3x=4
Mice21 [21]
True y=2x+1 and y-3x=4 it would be the same way because you can solve for x and you can solve for y
3 0
3 years ago
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