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ella [17]
3 years ago
15

The wavelength​ w, in meters per​ cycle, of a musical note is given by w=r/f, where r is the speed of the sound in meters per se

cond and f is the frequency in cycles per second.
The speed of sound in air is 344 m/ sec. What is the wavelength of a note whose frequency in air is 26 cycles per​ second? Round to the nearest tenth of a meter per cycle

A) 318.0 meters per cycle
B) 13.2 meters per cycle
C) 0.1 meters per cycle
D) 8,944.0 meters per cycle
Mathematics
1 answer:
Serjik [45]3 years ago
6 0
B. Plug in the numbers and use common sense.
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The area of a rectangle is 27ft squared, and the length of the rectangle is 3ft less than twice the width. Find the dimensions o
oksano4ka [1.4K]

Answer:

width =4.5ft

length=6ft

Step-by-step explanation:

w = x

L = 2x-3

area = L*w

27 = x(2x-3)

27=2x^{2} -3x

2x^{2} -3x-27=0

2x^{2} +6x-9x-27=0

2x(x+3)-9(x+3)=0

(2x-9)(x+3)=0

2x-9=0

2x=9

x=9/2

x=4.5

L=2x-3=2*4.5-3 =9-3=6

6 0
3 years ago
Select all the expressions that are equivalent to -36x+54y−90.
CaHeK987 [17]

Answer:

b) -18(2x -3y + 5)

d) 18(-2x + 3y - 5)

e) -2(18x - 27y + 45)

Step-by-step explanation:

a) -9( 4x - 6y - 10) = -36x + 54y + 90 not equal

b) -18(2x - 3y + 5) = -36x + 54y - 90 equal

c) -6(6x + 9y - 15) = -36x - 54y + 90 not equal

d) 18(-2x + 3y - 5) = -36x + 54y - 90 equal

e) -2(18x - 27y + 45) = -36x + 54y - 90 equal

f) 2(-18x + 54y - 90) = -36x + 108y - 180 not equal

7 0
2 years ago
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Can u solve this for me: 72 + 4x = 2x + 82 and please show work
8_murik_8 [283]
The answer is X = 5 because first you have to take away 2x from that side so u minus 2x from 4x that gives u: 72 + 2x = 82 then you have to minus 72 from both sides and that gives you 2x = 10 once you have that you divide both sides by 2 because you want the X by itself and once you get that X = 5. Hope this helped!
8 0
3 years ago
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Find the total cost to the nearest cent. $58 bill; 20% tip
harkovskaia [24]

Answer:

$69.60

Step-by-step explanation:

20% of $58 is $11.60. So you add $11.60 + 58 which equals $69.60, so that is the total cost.


8 0
3 years ago
Read 2 more answers
What is the answer to this question ?
NNADVOKAT [17]
I think its d but im not sure
3 0
2 years ago
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