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Juli2301 [7.4K]
4 years ago
12

Adam had $75.00 to buy his Dvds.

Mathematics
1 answer:
katen-ka-za [31]4 years ago
5 0
Answer:

$4.74

Explanation:

Adam starts with $75, but spends $70.26.

You can set up a subtraction equation to get your answer.

75 - 70.26 = 4.74
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Jenna is at a fair with four friends. They all want to ride the roller coaster, but only three people can fit in a car. How many
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Answer:

They can make 10 different groups of three.

Step-by-step explanation:

The order in which the people are in the car is not important, so we use the combinations formula to solve this question.

Combinations formula:

C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

How many different groups of three can the five of them make?

Combinations of 3 from a set of 5. So

C_{5,3} = \frac{5!}{3!(5-3)!} = 10

They can make 10 different groups of three.

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