Javier asks his mother how old a tree in their yard is. His mother says, "The sum of 10 and two-thirds of that tree's age, in ye
ars, is equal to 50." Javier writes the equation (10 + two-thirds) a = 50, where a is the tree's age in years. His equation is not correct. What error did he make?
There are three words in geometry<span> that are </span>not<span> formally defined. These three </span>undefined terms<span> are point, line and plane.</span>
