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3 years ago

HELP ASAP PLEASE ………………..

Mathematics

2 answers:

Natalka [10]3 years ago

4 0

Answer:

I think it's D

ivanzaharov [21]3 years ago

3 0

Answer:

its D

Step-by-step explanation:

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In the questions below nine people (Ann, Ben, Cal, Dot, Ed, Fran, Gail, Hal, and Ida) are in a room. Five of them stand in a row

julsineya [31]

Answer:

Step-by-step explanation:

Ben is present in all pictures so rest of 4 persons to be selected from 8 persons , no of ways to do it is

⁸C₄ = 8 x 7 x 6 x 5 / 4 x 3 x 2 x 1

= 70 .

In one of these combination , we can get 5 ! ( five factorial )

Total no of permutations

= 70 x 5 !

= 8400 .

b ) Both Ed and Gail are present

The above derivation changes to the following .

Total no of permutations

= ⁷C₃ x 5 !

= 35 x 120

= 4200

c )

exclude 2 person from 9 to be selected

permutation

= ⁷C₅ x 5 !

= 21 x 120

= 2520

d )

rest of 3 person from 7 persons , no of permutations

⁷P₃ = 7 x 6 x 5 = 210

e )

Hal or Ida can occupy any of the 5 position which can be done in 5 ways .

when one position is occupied , the rest of 4 position can be occupied by 7 persons which can be done in

⁷P₄ ways

Total ways = 5 x ⁷P₄

= 5 x 840

= 4200

f )

They can occupy position like 1,2 or 2,3 or 3,4 or 4,5

Rest of the position can be occupied in ⁷P₃ ways

Total ways = 4 x ⁷P₃

= 4 x 210

= 840

They can also be exchanged mutually so no of ways

= 840 x 2 = 1680 .

g ) No of pictures in which Ann and Ben are present

two position to be selected out of 5 = ⁵P₂

Rest of position that can be shuffled = ⁷P₃

Total no of pictures in which both are present

= ⁵P₂ x ⁷P₃

= 20 x 210

= 4200

out of which they will be standing next to each other = 1680

no of pictures in which they will not be standing next to each other

= 4200 - 1680 = 2520. .

3 0

3 years ago

HELP ME PLEASEEEEEEEEEEEEEEEEEEE

vova2212 [387]

The Middle one

Step-by-step explanation:

There are 4 faces, all are triangular. 1 base and 3 lateral faces. Hope this helps!

4 0

3 years ago

Read 2 more answers

CAR WASH To raise money for their rowing club, Halima, Aisha, and Fatima

Dmitry [639]

Answer:

The area of the neighborhood in which they are advertising is 8.75 km²

Step-by-step explanation:

The coordinates of the street corners are;

(3, 15), (6, 4) and (11,9)

Therefore;

The distance between each street corner are found using the following formula;

$Distance, \ d=\sqrt{\left (y_{2}-y_{1} \right )^{2}+\left (x_{2}-x_{1} \right )^{2}}$

Substituting, using an online tool, we find the distances;

Between (3, 15) and (6, 4), d = √32.5 km

Between (6, 4) and (11,9), d = √12.5 km

Between (3, 15) and (11,9), d = 5 km

The area is given by Heron's formula as follows;

$A = \sqrt{s\cdot \left (s-a \right )\cdot \left (s-b \right ) \cdot \left ( s-c \right )}$

Where;

s = (√32.5 + √12.5 + 5)/2

a = √32.5

b = √12.5

c = 5

Substituting (using an online tool) the values gives;

A = 8.75 km²

The area of the neighborhood in which they are advertising is 8.75 km²

4 0

3 years ago

Kevin is 39 years old and daniel is 3 years old. how many years will it take until kevin is only 4 times as old as daniel?

Likurg_2 [28]

I hope this helps you

5 0

3 years ago

Pls help me <br> I will give brainliest

Katarina [22]

Answer:

I am you helper

Step-by-step explanation:

7 0

3 years ago