exam Maths Puzzle Numerical Ability

The cost, in millions of dollars, to remove x% of pollutin in a lake modeled by
c = 6,000/200 - 2x.

3rd question: What is the cost to remove 99% of the pollutant?

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exam Other Question

Graph the following equation: y= -1/4x

thanks for any help How many pounds of hamburger that $1.60 per pound must be mixed with 70 pounds of hamburger that costs $2.10 per pound to make a mixture that costs $1.70 per pound?