Answer: C
Step-by-step explanation:
f + t = 12 is the answer because it is saying to let the variables represent the hours spent producing shoes. And the hours spent is 12, so f+t is the amount of shoes (represented by variables) the factory can make in 12 hours.
The answer is u=4
u(2+u)-2u=16
2u+u^2-2u=16
The 2u's cancel out
u^2=16
You find the square root of u^2 and 16 which leaves you with
u=4
Since C only has two and although it may look like B has three terms, when the letters are joined together like that they are basically just become one big term, so your answer would be A.