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3 years ago

Please help

Mathematics

2 answers:

MAXImum [283]3 years ago

7 0

Answer:

0.3243

Step-by-step explanation:

son4ous [18]3 years ago

4 0

Answer:

Step-by-step explanation:

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A shop has 8 different types of postcards and at least 13 of each type. how many selections of 12 postcards are there if

Zolol [24]

Answer:

Answered

Step-by-step explanation:

It is a combbinatorics problem. let's think as we need to do 8 partitions

of these 13 to separate the postcards of different types. So The number of

partitions of n=13 into r=8 terms counting 0's as terms as C(n+r-1,r-1).

(a)

Here n=13 and r=8, put it in the above formula so we get C(13+8-1,8-1)= C(20,7)= 77520 selections.

b).

Here, either (i) we can choose none of type I or (ii) we choose one of type I

Case(i): r=7, n=12 (Here we have only 7 types to choose from)

Case(ii): r=7, n=11 (Here we have only 11 cards to choose and only 7 types to choose them from)

Case (i) + Case(ii) = ,C(12+7-1,7-1) + C(11+7-1,7-1) = C(18,6) + (17,6) = 18564+12376 = 30940 selections.

4 0

3 years ago

Help ! Easy 7th grade work ! I’ll give brainliest.

nika2105 [10]

5/7 because it is greater than 1/4

7 0

3 years ago

Read 2 more answers

Fencing How much fencing is required to enclose a circular garden whose radius is 28 m? Use 3.14 for . About nothing m of fenci

Andru [333]

Answer:

175.84 m

Step-by-step explanation:

Given that:

A circular garden which has a radius of 28 m.

$\pi$ = 3.14

To find:

The fencing required to enclose the circular garden ?

Solution:

Here, we are given a circle and its radius.

We are required to find the perimeter of the circle in order to find the fencing required to enclose the circular garden..

Formula for finding the perimeter of a circle is:

Perimeter = $2\pi r$

where $r$ is the radius of the circle.

Using the given values in the formula:

Perimeter = $2\times 3.14 \times 28$ = <em>175.84 m</em>

Therefore, 175.84 m of fencing is required.

8 0

3 years ago

9x2 - 25

Delvig [45]

-2.54

Step-by-step explanation:

rockstar

8 0

3 years ago

Sally has a discount card that reduces the price of her grocery bill in a certain grocery store by 5%. If c represents the cost

amm1812

The original price is c. Then the grocery bill will be: c - 0.05c = 0.95 c. You can also say since the beggining that 5% disscount implies 0.95 factor, which leads to c * 0.95 = 0.95c. Sorry if it’s wrong

3 0

2 years ago