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3 years ago

How many ways can a president, vis-president and treasurer be selected from a group of 15 students?

Mathematics

1 answer:

dybincka [34]3 years ago

8 0

Answer:

455ways

Step-by-step explanation:

This is expressed as 15 C 3 ( C- combination)

The concept of combination is used when we talk about selection.

Now we are selecting 3 from a sample of 15

15 C 3 = 15! / (15-3)! 3! = 15 ×14×13×12!/12!×3×2

= 5 × 7 × 13 = 455ways

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2 years ago

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Rex paid $250 in taxes to the school district that he lives in this year. This year's taxes were a 12% increase from last year.

Verizon [17]

Answer:

$223.21

Step-by-step explanation:

Last year the amount of taxes was x, an unknown amount. That was 100% of last year's tax cost.

This year, taxes went up by 12%, so this year the taxes are 112% of what they were last year. This year the taxes were 112% of x, and they were $250.

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2 years ago

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3 years ago

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2 years ago

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3 years ago