exam Maths Puzzle Numerical Ability

Telephoto lens. Use the formula 1/F=1/O + 1/I to find the image distance I for an object that is 2,000,000 mm from 250 mm telephoto lens.

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exam Other Question

In the figure, AB ll CE (AB is parallel to CE), AE = 12, DE= 6, and CE= 4. What is the length of AB? My problem is to find the number c such that the vertex of f(x)=x^2+8x+c lies on the x-axis.