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Ede4ka [16]
3 years ago
10

I need help plz..... ☺

Mathematics
2 answers:
Kamila [148]3 years ago
4 0
It's 42, here's a quick trick to do this, so we know there's 7 movies, and to find the combination we know we can't choose 2 of the same movie, so to make this part easier , in your head take one movie from the stack out of the stack now there's 6 movies. It's now just the "plug and play" step , (7)*(6)=(42)
I'm sorry If this is to long of an explanation, but I hope that this helps you understand on how to do this problem. Have a nice day :)
Alex17521 [72]3 years ago
4 0
Use factorials to solve this question.

When you are choosing multiple items out of a set, the permutation formula will be represented by the following:

\frac{n!}{(n-r)!}

n represents the total amount of items, and r represents the number of items you're choosing from the set.

The stack has 7 items, and you are choosing sets of 2 items from the stack. Plug the values into the formula:

\text{n = 7, r = 2}
\frac{7!}{(7-2)!} = \frac{7!}{5!} = \boxed{42}

There will be 42 different combinations to choose from.
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1. Mark and Bill have a combined weight of 170
qwelly [4]
<h3>Equation : x + y = 170 and y = 2x - 40</h3><h3>The weight of Bill is 70 pounds and weight of mark is 100 pounds</h3>

<em><u>Solution:</u></em>

Let the weight of Bill be "x"

Let the weight of mark be "y"

Given that,

Mark and Bill have a combined weight of 170  pounds

Therefore,

x + y = 170 ------- eqn 1

Mark weighs 40 pounds less than twice Bill's  weight

y = 2x - 40 ------- eqn 2

<em><u>Substitute eqn 2 in eqn 1</u></em>

x + 2x - 40 = 170

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