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3 years ago

Any two lines lie in exactly one plane. True False

1 answer:

6 0

<u>Answer:</u> False

<u>Explanation / Counterexample:</u> Two lines in a 3-dimensional space can lie in two different planes.

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5 of 8

aleksandr82 [10.1K]

Given:

The mean age of 5 people in a room is 26 years.

A person enters the room. The mean age is now 33.

To find:

The age of the person who entered the room.

Solution:

Formula for mean:

$\text{Mean}=\dfrac{\text{Sum of observations}}{\text{Number of observations}}$

The mean age of 5 people in a room is 26 years.

$26=\dfrac{\text{Sum of ages of 5 people}}{5}$

$26\times 5=\text{Sum of ages of 5 people}$

$130=\text{Sum of ages of 5 people}$

The mean age is now 33. It means, the mean age of 6 people is 33.

$33=\dfrac{\text{Sum of ages of 6 people}}{6}$

$33\times 6=\text{Sum of ages of 6 people}$

$198=\text{Sum of ages of 6 people}$

Now, the age of the person who entered the room is

Required age = Sum of ages of 6 people - Sum of ages of 5 people

= $198-130$

= $68$

Therefore, the age of the person who entered the room is 68 years.

6 0

3 years ago

Name 5 decimal numbers that are between 4.78 and 4.79. Explain your answer.

Karolina [17]

4.781, 4.782,4.783,4.784,4.785

I can't explain though:(

6 0

2 years ago

Read 2 more answers

What two sums are equal to 3 3/4? Pls show work.

Rina8888 [55]

3 + 3/4 = 3 3/4

Ans: 3 and 3/4

2 + 1 3/4 = 3 3/4

Ans: 2 and 1 3/4

5 0

2 years ago

sam wants to put a fence around his garden. the garden is 6 yards long and 4 yards wide. how many yards of fencing should he ord

mixas84 [53]

He should order 20 yards

4 0

2 years ago

Write an equivalent fraction for 10/2

Scorpion4ik [409]

10/2 is an improper fraction. So, change it to a mixed number. 10÷2=5

5 is the mixed number and is the equivalent fraction. You can also do 5/1 which is also equivalent.

7 0

3 years ago