Hey there!
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ANSWER: 
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EXPLANATION:</h2>
Every factor must be equal to zero. The terms should also be equal to 0.

Hope this helps!

Zero pairs can be (+1)+(-1)=0.
R = kp/st
18 = 12k/(1/6 x 2)
18 = 12k/(1/3)
18 = 36k
k = 18/36 = 1/2
6 ribbons
1/4 yard long each
4 yards = 4 ribbons
4/4 yards
A: 6/4 yd
8-3(2)
8-5
=3
the answer should be 3 after plugging in the variables.