Problems And Answers PHIMO MOCK 2020 SENIOR SECONDARY

11. Kier has a salary of \($202, 020, 020\) this year, Next year, his salary will increase by \(300%\). The year after, his salary will decrease by \(75\%\). Compute his salary in two years.

12. Let \(f(x) = x^4\) and \(g(x) =\frac{1}{x^4}\) . Find the value of \(f”(2)g”(2)\).

13. Compute the smallest root of \(x^4 – x^3 – 5x^2 + 2x + 6\).

14. Find all real \(x\) that satisfy the equation \(\sqrt[3]{20x + \sqrt[3]{20x + 20}} = 20\).

15. Compute \(\lim_{x→3}\frac{x^2 + 4x – 21}{x^2 – 4x + 3}\)