exam Maths Puzzle Numerical Ability

A rectangular animal pen with area 1200 m^2 has one side along a barn. The other three sides are enclosed by 100 m of fencing. Find the dimensions of the pen.

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exam Other Question

y=2^x++1?
y=x+6=?
y=log2(x-1)andy=x^3-4x find the graphs?
solve log2(x-1)=x^3-4x.
what does non linear mean?
what other methods do we have to solve these systems? Write the equation of the line with slope -2 and y-intercept (0,0). Then graph the line. Is it y=-2x? Please help!