- How do I find the total cost and additional cost in this math problem?

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Fence to be built to enclose area of 20k ft Material costs 2.50 per ft for 2 sides, 3.20 per ft for other sides Find cost of least expensive? Are solutions pure substances? When potassium and sulfur react to produce an ionic compound, how many total electrons are transferred for each formula unit? What is the largest remainder you can have when dividing by 3 in base five? Why? Please HELP!!!!!! Two-digit natural numbers are formed, with replacement, from the digits 0 through 9. How many numbers are greater than 57?