Nine people are entered in a race. If there are no ties, in how many ways can the first three places be awarded

Which expression gives the exact value of x?

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.

The graph shows how many words per minute two students read. drag to the table the unit rate that matches each graph.