Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Decode below rebus
D
N
A
T
S , D

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

Why is Saturday stronger than Monday?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

What building has the most stories?

Can you decipher the below rebus?

PBLUESAISNUERSES