book Maths Puzzle Numerical Ability

Hi...there was no way i could figure this one out.

Apply the quadratic formula to find the roots of the given function, and then graph the function.

g(x) = -2x^2 + 8x - 3

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book Other Question

Could some one help me with this one? Please!!!!!!!!!!!!!

"The number of senior citizens (65 years old and over) in the United States in millions in the year 1970 + n can be est this is a basic question i am sure? but what is the rule for converting a fraction into a decimal?