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Mumz [18]
3 years ago
12

On a workday, the average decibel level of a busy street is 70 db, with 100 cars passing a given point every minute. if the numb

er of cars is reduced to 25 every minute on a weekend, what is the decibel level of the street?
Mathematics
1 answer:
nignag [31]3 years ago
4 0
70dB is represented by 100cars in 60sec. Therefore if the number of cats is reduced by 3/4 in the same amount of time(60s), then the decibel level will reduce by 3/4 also. So 70dB * .25= 17.5dB
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Please help me to figure out this question. Thanks
Marta_Voda [28]

Answer:

a) 5 : 7

b) 25 black keys

c) 100 black keys will appear.

Step-by-step explanation:

a) From the picture,

There are 5 black keys and 7 white keys.

Therefore, the ratio of black keys to white keys are = 5 : 7 = 5/7

b) If the pattern continues, 25 black keys will be appeared on a portable full-sized keyboard.

Explanation -

From part A, we get the ratio of black keys to white keys = 5 : 7. Therefore,

If there are 7 white keys, there are 5 black keys

If there are 1 white keys, there are 5/7 black keys

If there are 35 white keys, there are (5*35)/7 black keys

= 25 black keys.

c) If there are 240 keys, the black keys will appear -

We get, the ratio of black keys to white keys = 5 : 7

The summation of the black keys and white keys = (5 + 7) = 12.

Therefore, if there are 240 keys, the black keys will be

= (5/12) x 240

= (5 x 240)/12

= 100

Therefore, there are 100 black keys.

7 0
3 years ago
Please help I will mark Brainly
Alekssandra [29.7K]
Here u go: D. integer, B.Rational and C. real
3 0
3 years ago
Elyssa works as an assistant coach. She earns $10.95 per hour. How much will she get
saul85 [17]

Answer:

82.125

≈82.12 ( am not sure if it need to be estimated )

Step-by-step explanation:

1 hr -> 10.95

30m-> 5.475

10.95x7=76.65

76.65+5.475=82.125

                    ≈82.12 ( am not sure if it need to be estimated )

7 0
3 years ago
Please help. Which function represents an initial population that increases 22% per year where A represent the intial value and
jeyben [28]
C would be correct
6 0
3 years ago
a jug for a baseball team holds 20 gallons of water to make an energy drink one cup of mix is used for every 2 gallons of water
Solnce55 [7]
Assuming that the mix disolves into the 20 gallons and doesn't take up space

1:2
x:20
1/2=x/20
multiply btoh sides by 20
10=x

answer is 10 cups of mixture
5 0
3 years ago
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