Which decimals are between 10% and 20%? 0.11 0.09 0.13 0 0.19 0.011

A textbook search committee is considering 13 books for possible adoption. The committee has decided to select 3 of the 13 for f

laiz [17]

Number of ways in which the 3 can be selected from 13 = 286

Step-by-step explanation:

Step 1:

Number of books considered by the textbook search committee = 13

Number of books selected from this 13 = 3

We need to determine number of ways in which the 3 can be selected from the 13

Step 2 :

The order of the 3 books selected does not matter. So,

Number of ways in which the 3 books can be selected from 13 books = C(13,3) = $\frac{13!}{10! . 3!}$

= $\frac{ 13 . 12 .11 . 10!}{10! . 3! }$

= $\frac{1716}{6}$ = 286

Step 3 :

Answer :

Number of ways in which the 3 can be selected from 13 = 286

8 0

3 years ago

The table shows the year groups of some students who use the canteen. Mr Ford wants to survey 50 of these students stratified by

igor_vitrenko [27]

7 more year 9 students than year 8 students should be surveyed, If Mr.Ford wants to survey 50 of these students stratified by year group.

Step-by-step explanation:

The given is,

Year Students

7 80

8 110

9 160

Total 350

Mr.Ford wants to survey 50 of these students stratified by year group.

Step:1

Formula to find the ratio of number of grouped students to total students,

$Ratio, r = \frac{Number of students grouped }{Total number of students}$

= $\frac{50}{350}$

= 0.1428

Step:2

Formula for Number of students surveyed from year wise,

For year 7 students,

= (Ratio) × (Students from year 7)

= 0.1428 × 80

= 11.424

≅ 11 (∵ For students we convert into whole number)

For year 8 students,

= (Ratio) × (Students from year 8 )

= 0.1428 × 110

= 15.708

≅ 16 (∵ For students we convert into whole number)

For year 8 students,

= (Ratio) × (Students from year 9 )

= 0.1428 × 160

= 22.8

≅ 23 (∵ For students we convert into whole number)

Step:3

To find How many more year 9 students than year 8 students should be in the survey

= ( Students from year 8 for group) -

( Students from year 8 for group)

= 23 - 16

= 7 students

Result:

7 more year 9 students than year 8 students should be surveyed, If Mr.Ford wants to survey 50 of these students stratified by year group.

6 0

2 years ago

Read 2 more answers

A beach ball has a diameter of 10 inches. What is the volume of air contained inside the beach ball? Use 3.14 for pi. Round your

Nikitich [7]

A beach ball is a sphere, so we will need to know how to find the volume of a sphere.
V=4π(r³/3)
We have the diameter, but not the radius. To find the radius, it is half of the diameter.
10÷2=5
Now let's plug it in.
4π(5³/3)
Let's solve.
4π= 12.56
5³= 125
125÷3= 41.67 (repeating 6)
41.67×12.56= 523.3752
523.33 cubic inches is the volume of air contained inside the beach ball. The reason I picked that answer is because we rounded up to 41.67, when there was a repeating 6. So we should expect for the answer to be a couple decimals lower from the answer we got.
Tell me if this helps!!

6 0

3 years ago

PLEASE HELP ASAP!!!!!!

solmaris [256]

the answer would be x=6

to find it you would set 3x-2 equal to 2x+4 and solve because the two sides would be equal if the triangles are congruent

hope this helps :)

4 0

3 years ago

Read 2 more answers

A nature museum has 2008 specimens of early birds, some with 222 wings and some with 444 wings. The specimens have a total of 40

ludmilkaskok [199]