Match the vocabulary word to its correct definition. 1. element 2. null set 3. set 4. subset A a set containing no elements; also called the empty set B a member of a set C set A is a subset of set B if all of the elements of set A are contained in set B or it is the empty set D a collection or group of objects indicated by braces, { }

1. Element - B. A member of a set

2. Null set - A. A set containing no elements; also called the empty set

3. Set - D. A collection or group of objects indicated by braces, {}

4. Subset - C. set A is a subset of set B if all of the elements of set A are contained in set B or it is the empty set

hope this helps!

is there any attachment? what are the equations?

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.