'The first number is 3.'
[Note: bangou most commonly means phone number, but here it wouldn't make sense]
'It is the first door on the right.'
'The second number is 9.'
'The third number is 7.'
'(This/That/She) is my younger sister.'
'(These/Those/They) are our parents.'
Where's the bathroom.
'It is the second door on the left.'
"Shita" is a Japanese word and in English it means "Down"
I think you mean "genki desu ka". The correct way of spelling it in English would be "ogenki desu ka". It is Japanese for "How are you?" One would usually answer by saying "Genki desu. Anata wa?' which means "I'm fine, and you?"
"Denwa bangou wa" (電話番号は) is a Japanese phrase that translates to "the phone number is" in English. It's commonly used when someone is about to provide or ask for a telephone number. The phrase can be part of a larger sentence when inquiring about or stating a specific phone number.
"O-ai dekite ureshii desu" is a Japanese phrase and in English it means "Nice to meet you"
"Garufurendo shinai desu" (ガルフレンドしないです) translates to "I don't have a girlfriend" in English. The term "garufurendo" is a loanword derived from "girlfriend," and "shinai" means "not do" or "do not." The addition of "desu" adds a level of politeness to the statement.