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zmey [24]
4 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]4 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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Which number line can be used to find the distance between (-1, 2) and (-5, 2)
wariber [46]

Answer:

y = 2; distance is 4 units

Step-by-step explanation:

Line y = 2

Because the y- coordinate is the same, only horizontal movement from -1 to -5..

Which is 4 units

6 0
3 years ago
Read 2 more answers
] What percentage of the last 30 U.S. Presidents were inaugurated at the age of 60 or later? (Round to 1 decimal place.)
svetlana [45]

Answer:

20.0%

Step-by-step explanation:

The last 30 presidents of America starts from the 16th president, Abraham Lincoln and ends with the current and 45th president, Donald Trump.

The presidents that are 60 and above years during this period include

Donald Trump, Goerge H. W. Bush, Roland Regan, Gerald Ford, Dwight D. Eisenhower and Harry S. Truman.

Making 6 of them out of 30

The percentage is given by

Number of presidents aged 60 and above×100/Total number of presidents

6×30/100=20%

7 0
3 years ago
The ratio of sues age to her fathers age is 2:7 in three years their ages will total 60, how old is sue and her dad right now
USPshnik [31]
Sue is 12 and her father is 42
7 0
4 years ago
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Suppose 20 students delegates will attend the conference. Each school should be represented fairly in relation to it's populatio
algol [13]

Answer:

To find out the number coming from each school, you need to use the proportion of the school's population out of the population of all three.

Total population = 618 + 378 + 204

= 1,200 students

North Middle school:

= 618/1,200 * 20

= 10 students

Central Middle School:

= 378 / 1,200 * 20

= 6 students

South Middle School:

= 204/1,200 * 20

= 4 students

7 0
3 years ago
Belen has $1.65 deducted from her allowance every time she forgets to do a
zavuch27 [327]

Answer:

9.75

Step-by-step explanation:

1.65 x5 is 8.25 then you add half of 1.65 which is .825 to get 9.75

3 0
2 years ago
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