The answer is 12+3r because 4 times 3=12 then the 3r which you cannot add because they are no others variables that are r
There is an app called socratic, also if this assignment goes with a text book there is an app called sladder that has all textbook answers with work
Not sure its A but use this http://www.mathpapa.com/algebra-calculator.html
Answer:
Hello! answer: 60 and the triangle is a Equilateral because each measure is the same HOPE THAT HELPS!
