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3 years ago

There are 88 Keyes on a piano.some keys are black and some keys are white .

Mathematics

2 answers:

skad [1K]3 years ago

6 0

88 - x

x less than 88 is the # of black keys

shepuryov [24]3 years ago

5 0

It would be C.88-x and there are 36 black keys on an 88 key piano

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Please help, this is a chapter on Derivatives.

horsena [70]

Answer:

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Which ratio is equal to 78?

lyudmila [28]

Answer:

78 : 162 = 13 : 27. These two equalities are examples of proportions (equal ratios); it is as simple as that.

5 0

3 years ago

We have all probably played games like monopoly or yahtzee that use standard six sided dice. what does it mean for dice to be fa

Nonamiya [84]

1/6 of the time

so to find out

25/85=1/6?
5/17=1/6?
0.29=0.16?
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8 0

2 years ago

The University of Montana ski team has thirteen entrants in a men's downhill ski event. The coach would like the first, second,

sleet_krkn [62]

Answer:

1716 ways

Step-by-step explanation:

Given that :

Number of entrants = 13

The number of ways of attaining first, second and third position :

The number of ways of attaining first ; only 1 person can be first ;

Using permutation :

nPr = n! ÷(n-r)!

13P1 = 13! ÷ 12! = 13

Second position :

We have 12 entrants left :

nPr = n! ÷(n-r)!

12P1 = 12! ÷ 11! = 12

Third position :

We have 11 entrants left :

nPr = n! ÷(n-r)!

11P1 = 11! ÷ 10! = 11

Hence, Number of ways = (13 * 12 * 11) = 1716 ways

8 0

2 years ago

PLEASE HELP!! Dee bought 6 dolls and 2 toy trains for $55. At the same prices, Joy bought 4 dolls and 7 toy trains for $65. What

GuDViN [60]

Answer:

The cost of 1 doll = $ 7.5

and The Cost of 1 toy train = $ 5

Step-by-step explanation:

Let the price of 1 doll = $ x

The price of 1 toy train = $ y

Now, according to the question:

6 x + 2 y = $ 55

and 4 x + 7 y = $ 65

Solving the given system of equation,

From (1), we get

$x= \frac{55 - 2y}{6}$

$4 ({\frac{55 - 2y}{6}} ) + 7y = 65$

or, solving for y , we get

110y - 4y + 21 y = 195

or, 17 y = 85

⇒ y= 85/17 = 5

This implies : 6 x + 2 (5) =55

or, 6x = 55 - 10 = 45

or, x = 45/ 6 = 15/2

Hence, the cost of 1 doll = x = $ 7.5

and the Cost of 1 toy train = y = $ 5

5 0

3 years ago