A is the answer. Reflection and rotation.
3- 5/9= 2.45
3- 23/9= .45
2.45/.45= 5.44
5.44^3/2= 81
In its most general form, algebra is the study of mathematical symbols and the rules for manipulating these symbols; it is a unifying thread of almost all of mathematics. It includes everything from elementary equation solving to the study of abstractions such as groups, rings, and fields.
Answer:

Step-by-step explanation
Three-fifths of a number means
and 21 less than that number means
.