Prove that the below maths equation is true.

8 + 8 = 91

You bought me for dinner but never eat me. What am I?

What always comes into a house through the keyhole?

When can we add 2 to 11 and get 1 as the correct answer?

What kind of tree can you carry in your hand?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Which fur should we be getting from the Lion?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?