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kompoz [17]
3 years ago
7

In a class of 40 students, 75% returned their permission slips for the field trip. How many students returned their permission s

lips?
Mathematics
2 answers:
Dmitriy789 [7]3 years ago
4 0

Answer:

30

Step-by-step explanation:

75% can also be written as 3/4. 3/4 can also be written as 30/40, or 30 out of 40, which in this case, means 30 out of 40 kids.

vovikov84 [41]3 years ago
3 0

Answer:

30 Students Returned their Permission Slips

Step-by-step explanation:

In a class of 40 students, 75% returned their permission slips for the field trip. How many students returned their permission slips?

75% of 40 is 30, therefore 30 students returned their permission slips. 75% is equivalent to 3/4,  or 30/40.

Please let me know if you need anymore help

Good luck! :3

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Draw the shape described below and find its total surface area.
iogann1982 [59]

Answer:

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Step-by-step explanation:

8:07

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3 years ago
Please help fast and show your work
Wittaler [7]

Step-by-step explanation:

85-83=2

2/85×100

<h3>=2.3%</h3>
3 0
3 years ago
Rosie just moved to new york city and makes $2,700 per month at her new job. each month, she pays $2,000 for rent, $100 for the
oksian1 [2.3K]

Answer:

2700 - 2000 = 700 - 100 = 600 - 200 = 400 - 100 = 300

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7 0
2 years ago
Read 2 more answers
Raj measures the height of 70 plants calculate the estimate of the mean height of the plants
noname [10]

The mean height of plants is 44.07cm.

Given that a raj measures the height of 70 plants which is shown in the table in the image attached below.

The mean is defined as the mean value equal to the ratio of the total number of a given set of values ​​to the total number of values ​​contained in that set.

Firstly, we will find the midpoint of the height by using the formula

(upper limit +lower limit)/2

When h is 10<h<20 then the midpoint is

x₁=(10+20)/2

x₁=15

When h is 20<h<0 then the midpoint is

x₂=(20+40)/2

x₂=30

When h is 40<h<50 then the midpoint is

x₃(40+50)/2

x₃=45

When h is 50<h<60 then the midpoint is

x₄=(50+60)/2

x₄=55

When h is 60<h<90 then the midpoint is

x₅=(60+90)/2

x₅=75

Now, we will find the mean height by using the formula

x=(f₁x₁+f₂x₂+f₃x₃+f₄x₄+f₅x₅)/(Σfi)

Here, f₁=7,f₂=15,f₃=27,f₄=13,f₅=8

and Σfi=7+15+27+12+8=70

Substitute these values in the formula, we get

x=(7×15+15×30+27×45+12×55+8×75)/70

x=(105+450+1215+715+600)/70

x=(3085)/70

x=44.07

Hence,  the estimate of the mean height of the plants when raj measures the height of 70 plants is 44.07cm.

Learn more about mean from here brainly.com/question/3491195

#SPJ4

8 0
1 year ago
A sound wave travels at 330m/s and has a wavelength of 2 m. calculate its frequency and period.
RoseWind [281]

Answer:

frequency= 165Hz

period= \frac{1}{165}

Step-by-step explanation:

1. To calculate the frequency using the formula:

f = v/λ

where,

f=frequency (what the question asked)

v=speed of wave (given in the question=330m/s)

λ=wavelength (given in the question=2m)

SO,

f=\frac{330}{2}

= 165Hz

2. To calculate the period use the formula:

since f=\frac{1}{T}

therefore, T=\frac{1}{f}

where,

f= frequency (what we solved above=165Hz)

T= period (what the question asked)

SO,

T=\frac{1}{165}

4 0
2 years ago
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