Answer:
the answer is 19 cm
Step-by-step explanation:
+ + + + += + + + + +
DUH
I mean I think I'm right
Do you want us to answer or simplify?
Simplify:=−18x^7 y^3 + 21x^5 y^4+ 15x^2 y^5
2x + 4y = 12 and y = -1/2x + 3