A piano has white keys and black keys in the ratio of 13 : 9. If there are 52 white keys,how many black keys are there?

Answers

Answer 1

Answer: ✡ Answer: 9/36 ✡

- - Why?

Because if you look at it like this:

$(13)/(52) = (9)/(36)$

- 52 being the white and 36 because the black.

✡Hope this helps✡

Answer 2

Answer: Let w = white and b = black.
Using the proportion,
13/w = 9/b
Since w = 52 white keys, therefore
13/52 = 9/b
b = 36 black keys

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Answer:

the second one I believe as they have the same shape and size

Answer:

oop

Step-by-step explanation:

IMPORTANT PLEASE I NEED NOW:Find the area of each face of the cube whose volume is 729 cm

Answers

Answer:

Step-by-step explanation:

square root of 729= 9

9×9=81

Answer:

Step-by-step explanation:

Formula of Volume= $a^(3)$ - a = side

Therefore since the volume is given you just need to find the side.

729= $a^(3)$ = $\sqrt[3]{729}$ = a

= 9 = a

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12x8+4-4=what is the answer?

Answers

12*8=96 add 4 then subract 4 keeps you at 96. ANSWER=96

Answer: 96

Step-by-step explanation:

12 x 8 = 96

4 - 4 = 0

96 + 0

= 96

E=mc
$e = mc {}^(2)$

solve for c

Answers

e = mc
e/m = mc/m
e/m = c
c = e/m

i think it’s c = e / m

What 2 numbers multiplied equal -48 and 2 numbers added equals -2

Answers

-8 and 6.

work: -8 x 6 = -48
-8 + 6 = -2

Answer:

6 and -8

Step-by-step explanation:

6x-8=-48

6+(-8)=-2

to find these number list what numbers you multiply together to get -48 but if you add them together u get -2

since in multiplication the 48 has a negative sign the one number is negative the other is positive

and since in addition the 2 is negative then the bigger number is also negative

2x-24=-48 but 2+(-24)=-22 wrong

3x-16=-48 but 3+(-16)=-13 wrong

4x-12=-48 but 4+(-12)=-8 wrong

--->6x-8=-48 and 6+(-8)=-2 correct

How do I find precentges of money

Answers

The same you find the percentages of numbers

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