exam Maths Puzzle Numerical Ability

x(2x-x)+(3x+2)-(9x+9-3x)=

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exam Other Question

Find the slope intercept equation of the line that has the given characteristics.
Slope 3.7 and y-intercept (0, -4)
HELP PLEASE A radiator holds 4 gallons of fluid. If it is fullwith a 20% solution how muchfluid should be drained and replaced with a 70% antifreeze mixture to result in a 50% mixture of antifreeze?