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zmey [24]
3 years ago
7

As a result of the installation of a muffler, the noise level of an engine was reduced from 89 to 72 decibels. Find the percent

decrease in the intensity level of the noise due to the installation of the muffler.(Round your answer to the nearest whole number
Mathematics
1 answer:
Jobisdone [24]3 years ago
4 0

Answer:

Step-by-step explanation:

Using the formula

Initial -final/initial =%/100

89-72/89 =%/100

17/89 =%/100

Making %subject of the formula

% =17*100/89

So % =1700/89

%= 19.101

Therefore rounding off the answer we have

X=19%

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15y+31=61 how do I solve this
Setler79 [48]
15y + 31 = 61
15y = 61 - 31
15y = 30
y = 30 ÷ 15
<u>y = 2</u>
6 0
3 years ago
Find the area of a sector that has a central angle of 40 and a radius of 2 cm. Round your answer to the nearest 100th. Use 3.14=
Aneli [31]
I think the answer is around 1.4 as you need to multiply the area by 1/9 after finding the real area. 
6 0
3 years ago
Tony has 24 stamps in his collection this is 1/3 times the number of Jordan has how many stamps does Jordan have
Cerrena [4.2K]
You have to find 1/3 of 24, so it is  8
7 0
3 years ago
In 2015, an autonomous vehicle drove from the Golden Gate Bridge to New York City at an average speed of 15.7 miles per hour. Th
ivolga24 [154]

The speed is the distance covered by an object at a particular time. The distance that is covered by the vehicle is 3,391 miles.

<h3>What is speed?</h3>

The speed is the distance covered by an object at a particular time. Therefore, it is the ratio of distance and time.

Speed = Distance / Time

Given that the journey took 9 days. Therefore, the time in hours will be equal to,

Time = 24 hours/day × Number of days

        = 24× 9

        = 216 hours

Also, given that the speed of the vehicle is 15.7 miles per hour, the number of hours for which it travels is 216 hours.

Distance = Speed × Time

              = 15.7 miles/hour × 216 hours

              = 3,391.2 miles

Hence, the distance that is covered by the vehicle is 3,391 miles.

Learn more about Speed here:

brainly.com/question/15100898

#SPJ2

4 0
2 years ago
You buy a total of 50 turkey burgers and veggie burgers for $90. You pay $2 per turkey burger and $1.50 per veggie burger. Write
Slav-nsk [51]

Answer:

T + V = 50

2T + (3/2) * V = 90

2T + 1.5V = 90

T = 50 * 1.5 - 90 * 1 / 1 * 1.5 - 2*1 = 30

V = 1 * 90 - 2 * 50 / 1 * 1.5 - 2 * 1 = 20

Step-by-step explanation:

T = 30

V = 20

4 0
2 years ago
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