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3 years ago

Out of 40 students in class 8,20% were absent.How many students were present?

Mathematics

1 answer:

Alenkasestr [34]3 years ago

3 0

Understanding:

The total number of students is 40. 8.20% of them were absent, which means the rest were present, or in other words, (100-8.20)% were present or 91.8%. We can find the actual number of present students by multiplying the percentage of present students by the total number of students.

Solution:

Present Percentage = 91.8% or $\frac{91.8}{100}$

Present Students = $(\frac{91.8}{100})(40)=36.72$ , since we are dealing with people we have to round it, so the present students are actually 37.

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Sheila, janice, and katen, working together at the same rate, can complete a job in 3 1/3 days. Working at the same rate, how mu

pychu [463]

Answer:

Janice and Karen could do in 1 day:

20% of the job.

Step-by-step explanation:

To identify how much of the job could janice and caren do in 1 day, first, we must find how much of the job make just 1 person at the same rate:

If three persons make a job in 3 1/3 days, 1 person make the job in x:

3 persons ⇒ 3 1/3 days or 10/3 days
1 person ⇒ x

Then:

$x=\frac{1 person*\frac{10}{3}days }{3 persons}$ (we cancel the unit "persons")
$x=\frac{\frac{10}{3}days }{3}$
x = 10 days

Just a person would need 10 days to complete a job, now, we're gonna divide this value in 2 to obtain the time that need two persons to complete a job:

Time to complete a job between 2 persons = $\frac{10}{2}days$
Time to complete a job between 2 persons = 5 days

How two persons need 5 days to complete a job (in this case, the two persons are Janice and Karen), we can make a simple rule of three to obtain the percentage made in 1 day:

5 days ⇒ 100% of a job
1 day ⇒ x

Then:

$x=\frac{1*100}{5}$ (you can use the % if you want, the result is the same)
$x=\frac{100}{5}$
$x=20$

As you can see, Janice and Karen just in a day could do 20% of the job.

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2 years ago

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Step-by-step explanation:

Exponential function is given by general form $y=ab^x$

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$y=1*2^x$

or $y=2^x$

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Like plug x=0, 1, 2,... into above function and find points:

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Find more points similarly then graph them to get the graph as shown below:

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3 years ago

HELP What is the area of a circle with a radius of 13 feet? IT IS NOT 530.93 ft

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Answer:

530.66

Step-by-step explanation:

to find the area you need to do pi times the radius square and to find the radius squared you just times it by its self so 13 times 13 which is 169 and pi is 3.14

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Answer:

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Step-by-step explanation:

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Answer:

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3 years ago

Out of 40 students in class 8,20% were absent.How many students were present?​

Out of 40 students in class 8,20% were absent.How many students were present?