(show ur work) You spend $40 on 5 pounds of concrete. What is the unit rate in dollars per pound?
2 answers:
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First, square both sides. This will cancel out the radical.
(a^2 = b + 6)
Then subtract 6 from both sides
b = a^2 - 6
(a^2 = b + 6)
Then subtract 6 from both sides
b = a^2 - 6