1. Evaluate the expression mº - 2n + Zo when m = 4, n = 2, and p = 6. m² - 2n+ }
=(19-21)
Substitute the values
for each variable
Evaluate the power.
-21
-
- Multiply
--Multiply
Subtract
+
Add

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm