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almond37 [142]
3 years ago
8

A helicopter is hovering 100 meters above the ocean. Directly below it, a submarine is at a depth of 200 meters

Mathematics
1 answer:
Sati [7]3 years ago
3 0
So whats the question...?
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Giselle works as a carpenter and as a blacksmith.
Strike441 [17]
She worked for 12 hours as a carpenter and 18 hours as a black smith 
7 0
3 years ago
Give a combinatorial proof that if n is a positive integer, then
gregori [183]

The Empire is attacking a Rebel base that is stocked with n X-wings and n Y-wings. The Rebels need to build a fleet consisting of n ships (with at least 1 X-wing), to be led by 1 pilot in an X-wing.

There are \binom n1=n ways of picking the leader, and \binom{2n-1}{n-1} ways of building the rest of the fleet, so there's a total of

n\dbinom{2n-1}{n-1}

ways of building such a fleet.

In the other direction, suppose we build a fleet comprising of k X-wings and n-k Y-wings. We have \binom nk ways of picking X-wings and \binom n{n-k} ways of picking Y-wings. Also from the k X-wings we pick 1 to be the leader, which we can do in \binom k1=k ways. So there are

k\dbinom nk\dbinom n{n-k}

ways of building such a fleet. But since

\dbinom nk=\dbinom n{n-k}, we have

k\dbinom nk^2

ways of building the fleet with these specifications. Sum over all possible values of k,

\displaystyle\sum_{k=1}^nk\binom nk^2

4 0
4 years ago
A swimming pool is circular with a 40-ft diameter. The depth is constant along east-westlines and increases linearly from 2 ft a
AnnZ [28]

Answer:

volume will be equal to 5,655 ft³

Step-by-step explanation:

diameter of swimming pool = 40 ft

depth increases from east-west lines is from 2 ft to 7 ft

so the average depth of the swimming pool can be calculated by

   D_{avg} = \frac{2+7}{2}

hence average depth comes out to be  4.5 m

volume of water in the pool will be equal to the volume of the pool

volume = \pi\times r^2 \times d_{avg}

            = \pi\times 20^2 \times 4.5

            = 5,654.86 ft³

volume will be equal to 5,655 ft³ approximately

6 0
4 years ago
What are the values of the constants in the vertex form of the quadratic equation that models the bird's path? h = k = a =
kobusy [5.1K]

Answer:

Step-by-step explanation:oli

8 0
3 years ago
Read 2 more answers
The sum of 9/26 and -4/13
ohaa [14]

Answer:

Step-by-step explanation:

Ok, well the first thing you need to do is make -4/13 have the same numerator as 9/26. Thankfully, 26 is a multiple of 13, so that step is easy:

-4/13 -> -8/26

Then you can add them together with ease.

9/26 + -8/26 = 1/26

Adding a negative number to anything is the same thing as subtracting.

8 0
3 years ago
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