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tatyana61 [14]
3 years ago
10

How many black keys will appear on a pipe organ with a total of 240 keys?

Mathematics
1 answer:
Aneli [31]3 years ago
5 0

Answer:

100

Step-by-step explanation:

Black keys 5 10 100

Total keys

Black keys + white keys = 12 24 240

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a couple has narrowed down the choices of a name for their new baby to first names and middle names. how many different​ first-
emmainna [20.7K]

There are 28 ways in which a couple can choose the name of the baby for its name.

<h3>What is defined as the combination?</h3>
  • A combination is an algebraic technique for determining the number of possible arrangements in a set of items in which the order of the selection is irrelevant.
  • You can choose the items in just about any order in combinations. Permutations and combinations are often confused.

If we need to choose objects from two groups of x and n objects so that one object from each group is chosen, we can do so by calculating the combinations possible by:  

= ˣC₁  ×  ⁿC₁

Let 'x' be the set of first name = 7

Let 'n' be the set of second name = 4

Putting the values in formula;

= ⁷C₁ × ⁴C₁

= 7 × 4

= 28

Thus, there are 28 ways in which a couple can choose the name of the baby for its name.

To know more about the combination, here

brainly.com/question/12725706

#SPJ9

The complete question is-

A couple has narrowed down the choices of a name for their new baby to 7 first names and 4 second names.

How many different first- and second-name arrangements are possible?

8 0
1 year ago
In the equation 2r - 7 = 15, what value of r makes this equation true?
erastovalidia [21]

Answer:

11

Step-by-step explanation:

2r - 7 = 15

2r = 15 + 7

2r = 22

r = 22 / 2

r = 11

3 0
2 years ago
Input x=?<br>equation <br><img src="https://tex.z-dn.net/?f=%20f%28x%29%5Csqrt%7B2x%20-%206%7D" id="TexFormula1" title=" f(x)\sq
Flura [38]

Answer:

f(10)=sqrt(14)

Step-by-step explanation:

f(10) = sqrt(2x-6)

f(10)= sqrt(20-6)

f(10)=sqrt(14) - simplest form, no way to factor it.

6 0
3 years ago
The floor of a round hut has a diameter of 6 meters. What is the floor's area? Use 3.14 for ​pi.
storchak [24]
Area is 28.26 meters
3 0
3 years ago
Please help DO NOT IGNORE DO NOT IGNORE
lisov135 [29]

Answer:

24.997 cm

Step-by-step explanation:

Find the diameter:

7(2) = 14 cm

Find the circumference:

C = \pi d

C = \pi (14)

C = 43.988

Divide the circumference by 4:

43.988/4 = 10.997

(This is the length of the curved side)

Add length to the other 2 sides:

7 + 7 + 10.997 = 24.997

3 0
3 years ago
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