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

Can you identify the Oscar-winning movie from the rebus below?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

What does this below rebus puzzle mean?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?