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Answer:

1 . from it start from

Explanation:

it is to indicate from where the letter has come from

A letter bears the stamp of the place from where it starts.

• when we send any letter be it official or unofficial,it need to be send through a government post office.
• the post office gives us the stamp before posting the letter.
• this stamp is from the person who is sending it.
• also,it contains the sender's as well as recipient's address and name.
• this makes the delivery of letter easy and convenient.

Answer:

dresses, 7 pairs of shoes and 3 pairs of earrings Lucy could choose I dress, 1 pair of shoes and 1 pair of earrings every day. However, 1 dress and 1 pair of shoes don't look retty together, so they cannot be selected together

Given a the number of dresses, shoes and earrings, find the number of days to wear different outfits

Explanation:

1. in order to wear different outfits each day Lucy need to make different combinations out of the given dresses, shoes and earrings.
2. since one dress and one pair of shoes does not look good together we should remove the combination involving the pairing of these two.
3. number of dress is given [tex]8[/tex], hence number ways to select a dress out of these is                [tex]^8C_1=\frac{8!}{1!(8-1)!}=8 [/tex]  
4. similarly, we have [tex]7[/tex] pair of shoes and [tex]3[/tex] pair of earrings.
5. hence, number of ways to select a pair of shoes and earrings are [tex]7\ and\ 3[/tex] respectively.
6. now, the invalid combination are [tex]3[/tex] as dress and shoes' combination is fixed but earrings are still considered.
7. hence, total number of combination 'C' is,                                                            [tex]C=8(7)(3)-3\\ C=165[/tex]  ------>ANSWER

Answer:

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Answer:

1.270m

2.(v/a) cos a

3.mg / cos θ

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Explanation:

Answer: 20 seconds

Explanation:

Let the thief's speed be vT.

vT = 15m/s

Let the time it takes to catch the thief be T seconds.

Then the distance covered by the police car and the thief in the time T will be the same.

We know that the police vehicle's last speed is 20m/s.

20 = 0 + 2*t

here t is the time taken to reach 20m/s.

t = 10 seconds

Distance travelled by the thief by now(10s) = 150 m

Distance travelled by the police vehicle in 10 seconds = d

2*2*d = 20^2

d = 100m

Relative speed = 20m/s - 15m/s = 5m/s

Distance to cover = 50m

Therefore time from then = 10s

It takes a total of 10+10 = 20seconds to catch the thief.