exam Maths Puzzle Numerical Ability

Under which of the following conditions of k will this quadratic, x^2 + 8x + k - 0, have real-number, but unequal roots?

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exam Other Question

A company finds that its sales and earnings are declining due to a changing environment. They predict that earnings and dividends will decline indefinitely at a rate of 5% per annu if f(4)=0 and f(6)=6, which of the following could represent f(x)?

A. 2/3x-4
B. x+2
c. x-4
D. 3x-12


could u show me how to work this out and find the answer?