How do you go from 98 to 720 using just one letter?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

If eleven plus two equals one, what does nine plus five equal?

Move three sticks of the spiral below to form a square.

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

What can you see in the middle of March and April that you can never see in any other month?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

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.