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3 years ago

Greta has watched 30 minutes of a movie. This is 20%of the entire movie. How long is the movie?

1 answer:

german3 years ago

8 0

The answer is 180 minutes. because you multiply 30 times 0.20 and you get 6. Then you multiply 6 times 30 and get 180 minutes. And 180 minutes in hours is 3 hours.

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A curious patterns occurs in a group of people who all shake hands with one another. It turns out that you can predict the numbe

ycow [4]

Missing part of the question

Determine the number of handshakes, i, that will occur for each number of people, n, in a particular room. (people)

Answer:

$S_n = \frac{n}{2}(n - 1)$

Step-by-step explanation:

Given

For 5 people

$\begin{array}{cc}{People} & {Handshakes} & {5} & {4} & {4} & {3} & {3} & {2} & {2} & {1} & {1} & {0} &{Total} & {10} \ \end{array}$

Using the given instance of 5 people, the number of handshakes can be represented as:

$(n - 1) + (n - 2) + (n - 3) + ........ + 3 + 2 + 1 + 0$

The above sequence is an arithmetic sequence and the total number of handshakes is the sum of n terms of the sequence.

$S_n = \frac{n}{2}{(T_1 + T_n})$

Where

$T_1 = n - 1$ --- The first term

$T_n = 0$ --- The last term

So:

$S_n = \frac{n}{2}(n - 1 + 0)$

$S_n = \frac{n}{2}(n - 1)$

7 0

2 years ago

I need help with these questions, thanks!

kifflom [539]

Answer:

????

Step-by-step explanation:

number 1 could be 2 different answers

7 0

3 years ago

Mademuasel [1]

Answer:

I only

Step-by-step explanaition:

The domain (x) can not repeat in order for it to be a function.

3 0

2 years ago

Read 2 more answers

What’s the value of a ?

Mariulka [41]

Answer:

Step-by-step explanation: ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

8 0

3 years ago

Q: Simplify. <br><br>1. 3^(n+1) - 3^n / 3^(n-1)

igor_vitrenko [27]

Answer:

3^(n+1) - 3^n / 3^(n-1) = 6

7 0

2 years ago

Greta has watched 30 minutes of a movie. This is 20%of the entire movie. How long is the movie?​

Greta has watched 30 minutes of a movie. This is 20%of the entire movie. How long is the movie?