Abc is a triangle in which angle b is a right triangle, ab=1, ac=2, and bc = 3

Find the value of the cosine for angle a

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

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected