已知数列{a_n}满足a₁=2，a_n+1=2a_n+3．

（1）求{a_n}的通项公式；

（2）求数列{na_n}的前n项和S_n．

Perhaps you will visit New York one day. You might be a student there. Here is some advice.

Get a good map of the city. It will also have subway and bus maps. Remember the directions—uptown, downtown, east and west. Feel the excitement of New York .Have fun!

NEW YORK CONVENTION AND VISITORS BUREAU

Address:90 East 42nd Street,N.Y.100017

Telephone:6871300

TIMES SQUARE INFORMATION CENTER

Address:43rd Street between Seventh Avenue and Broadway

Telephone:5938983

TRAVELERS' AID SOCIETY

Address:204 ast 39th Street,N.Y.10016(central office)

Telephone:6790200

TRAVEL INFORMATION:NEW YORK SUBWAYS AND BUSES

Telephone:3301234

OTHER TELEPHONE NUMBERS

The weather:WE 61212.The time:ME 71212

Emergency (Police,Fire,or Ambulance):911 or “0” for operator

A doctor:8971000

USEFUL BOOK

Seeing New York; The official MTA Travel Guide,published by the Metropolitan Transportation Authority.

小题1:What would be the best title for the passage?

A．Introductions and directions

B．This is New York

C．Information and advice

D．Have fun here小题2:If you lose your passport in New York, you may probably get help from _______.

A．CONVENTION AND VISITORS BUREAU

B．TIMES SQUARE INFORMATION CENTER

C．USEFUL BOOK

D．TRAVEL INFORMATION小题3: If a visitor wanted to take a train, he could get some help by dialing the number “_______”.

A．8971000

B．3301234

C．WE 61212

D．911 or “0” 