How many ways can teacher arrange 4 students in front row of class with 30 students

Mathematics

2 answers:

harina [27]3 years ago

8 0

30 choices for first seat
29 for 2nd
28 for 3rd
27 for 4th

answer is 30*29*28*27=657720 ways

Cloud [144]3 years ago

6 0

Choose 4 students from 30
means 30P4
657720

You might be interested in

7.2801098892805 how can i caculate this ASAP PLS

Studentka2010 [4]

Answer:

ja s and the not only way I could

3 0

2 years ago

The cost of oranges varies directly as the number of oranges sold. If 8 oranges cost $10.40, how many oranges can be bought for

alexdok [17]

Answer:

Step-by-step explanation:

if you can get 8 oranges for 10.40 then divide 10.40 by 8. you can get each orange for 1.3. you need to know how many oranges you can get for 33.8 so divide that by 1.3 and you get 26

6 0

2 years ago

Read 2 more answers

This composite shape is a rectangle with a semicircle attached on one end. The diameter of the semicircle is 6 feet.

Ugo [173]

As we can see on the picture we have a rectangle and half of circle.

The areas for half circle and rectangle are:

$A_{rectangle}=a\cdot b \\A_{halfcircle}=\frac{A_{circle}}{2}=\frac{\pi r^2}{2}$

The area of the figure is the sum of the area of half circle and rectangle. Also the height of a rectangle (6ft) is a diameter of a half circle therefore the radius of half circle is 6ft ÷ 2 = 3ft.

Now we calculate the areas.

$A_{rectangle}=10\cdot 6=\underline{60} \\A_{halfcircle}=\frac{3.14\cdot3^2}{2}=\underline{14.13} \\A_{total}=A_{rectangle}+A_{halfcircle} =60+14.13=\boxed{74.13\approx74}$