exam Maths Puzzle Numerical Ability

can you explain this Quadratic equation in steps how to get the answer. y=-0.027x^2+1.35x

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exam Other Question

simplify

4m+1
------
12m+3
x-3/2<7-1/2x

f(x)=3(x+7)+1
a.f(x)<or equal to -5
b.f(x)>or equal to -5










for what value of x is the perimeter of the rectangle form 40 to 60 feet?
lengt