Answer:
You'll need 18.85 feet of ribbon.
Step-by-step explanation:
The circumference is 
.
42 and 14
explanation:
x+y = 56
x = 3y
Substitute for x in the first equation:
x + y = 56
x = 3y
3y + y = 56
Combine like terms:
4y = 56
Divide both sides by 4:
y = 14
So if y = 14, and x = 3y, then x = 42.
Now substitute for both x and y in both of the original equations to prove they are the correct values.
x + y = 56
x = 42
y = 4
42 + 14 = 56
56 = 56
x = 3y
x = 42
y = 14
42 = 3*14
42 = 42
So the two numbers, x and y, are 42 and 14.
5 pairs
one kind of writing paper for each coloured envelope
the last three papers would have to be in envelope colours that were already use so they cant be counted.
When adding/subtracting variables you can only add/subtract those variable that are of the same power....
3x^3-2x+8+2x^2+5x+x^3+2x^2-3x-3
(3x^3+x^3)+(2x^2+2x^2)+(-2x+5x-3x)+(8-3)
4x^3+4x^2+5
