Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

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 looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Can you make four (4) nines (9) equal 100?