How many different committees of 3 people can be formed from a group of 5 people?​

Ihave this math question 2/3 ÷2 1/10=

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

How does reflecting or rotating a figure change the interior angles of the figure?