Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

When it is alive we sing, when it is dead we clap our hands. What is it?

What is wrong in the below Picture?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

In the image below, can you find the value of an angle(y)