Help I'm stupid Fill in the blank

5.Rate is a ratio that usually involves a measure of (Blank)
6.When the denominator is a one that type of rate is called a
(blank) rate.

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

Ten times the square of a non-zero number is eqaul to ninety times the number

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?