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Doss [256]
3 years ago
7

200 children attended the school play. Of the total attendance, 40% were boys. How many

Mathematics
1 answer:
vesna_86 [32]3 years ago
5 0

Answer:

120

Step-by-step explanation:Do you hundred times 40% equals 80. 200-80 = 120 which is the number of girls that attended.

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A tennis tournament has 2n contestants. We want to pair them up for the first round of singles matches. Show that the number of
ddd [48]

There are

\dbinom{2n}2 = \dfrac{(2n)!}{2! (2n-2)!}

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(2n)! = 1\times2\times3\times4\times\cdots\times(2n-2)\times(2n-1)\times(2n) = (2n-2)! \times(2n-1) \times(2n)

so that

\dbinom{2n}2 = \dfrac{(2n)\times(2n-1)\times(2n-2)!}{2! (2n-2)!} = \boxed{n(2n-1)}

4 0
1 year ago
How do i do x/3=3 Please help!! thanks!!
Shkiper50 [21]
If you're looking for "x"

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6 0
3 years ago
Read 2 more answers
Quick help please!
pashok25 [27]
Congruent triangles are all the same. Given that the faces of a triangular pyramid are congruent then all its faces are the same. It is also good to note that this pyramid has 4 faces. Given that the surface area of the pyramid is 372m^2, the area of one face will be:
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3 years ago
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3 0
3 years ago
1.5 lbs of gum balls I want to buy it’s 3.99 per pound
zubka84 [21]

Answer:

$5.99 for 1.5 lbs of gumballs

Step-by-step explanation:

You want to buy One and a half pounds of gumballs for $3.99 per pound. It is 3.99 for one pound of gumballs, so the price for half a pound of gumballs is half of that price.

3.99 / 2 = 1.995

Then add the price of 1 pound

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Then you can round that up to 5.99

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3 years ago
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