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mina [271]
3 years ago
9

There are 80 students in the 7th grade. 25% of them were absent yesterday. How many

Mathematics
1 answer:
mariarad [96]3 years ago
7 0
I can show you one way. Since 25x4=100 we can start by dividing 80/4. Which gives you 20.
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In the diagram, the radius of the outer circle is 2x cm and
hodyreva [135]

Area shaded = Area big circle- Area of small circle;

200 pi= pi•(2x)^2 -pi•6^2;

200pi= pi•4x^2 -pi•36;

200pi=pi•4(x^2 -9) divide both sides by 4pi;

50=x^2 -9; So x=sqrt(59)~7.68cm

8 0
3 years ago
The designer sketched a model of the pond. The model drawing had a circumference of 24 inches. What is the AREA of the model she
Delicious77 [7]

Answer:

Area of model pond = 45.6 inch² (Approx.)

Step-by-step explanation:

Given:

Circumference of circular pond = 24 inches

Find:

Area of model pond

Computation:

Circumference of circle = 2πr

Circumference of circular pond = 2πr

24 = 2[22/7][r]

Radius r = [24 x 7] / [2 x 22]

Radius r = 3.81 inch (Approx.)

Area of circle = πr²

Area of model pond = πr²

Area of model pond = (22/7)(3.81)²

Area of model pond = [3.1428][14.5161]

Area of model pond = 45.6 inch² (Approx.)

6 0
3 years ago
The amount of money that Charlie saves each week is directly proportional to the amount he earns. Last week Charlie saved $32 on
Agata [3.3K]
If k is a constant of proportionality then we know from last week that
512= k ·32 so k=512/32=16;

This week 
448= k · amount he saved
448=16· amount he saved
amount saved=448/16=28

Answer $28


8 0
3 years ago
Read 2 more answers
Give the slope of each line. Also, state if the lines are parallel (yes or no).
VMariaS [17]

Answer:

AB slope is 1/2

CD slope is 1/3

Since the slopes of the lines aren't the same, the lines aren't parallel.

Step-by-step explanation:

5 0
3 years ago
I want to know what is 600 minutes to days
Damm [24]

Answer:

Not even a whole day. To be exact, it is .416667 of a day

Step-by-step explanation:

Since 60 minutes are in 1 hour, than 600 minutes would be 10 hours.

24 hours in a day, so you are 14 hours short, about 840 minutes.

6 0
3 years ago
Read 2 more answers
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