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 a 250-mm telephoto lens.

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exam Other Question

Wright an equasion and solv to answer each question.
Seven times a number decreased by 2 is 19. What is the number. Find the exact solution to 6x(squared)+1=-8x by using the Quadratic Formula.

Thanks. This is my first year and I greatly appreciate your help.