Find the missing number 12,24,72,288 and blank

What is the relationship between all triangles that can be drawn given the same three angles

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?