book Maths Puzzle Numerical Ability

Let 'n' be the number of shirts produced by Company ABC, and let 'p' be the price for a shirt. From past data, these two variables are related in the following way: p= -0.003n+20.

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book Other Question

x^2-19x+90=0
Solve by using quadratic formula I am asked to find the distance between the verticies of the graphs of f(x)=2(x+4)^2-3 and g(x)= -(x+1)^2-3. According to the form f(x)= a(x-h)^2+k the vertex is (h,k). So the vert