Problems And Answers PHIMO MOCK 2020 SECONDARY 1

16. If \(x + y = 0\) and \(x, y ≠ 0\), then what is the value of
\(\frac{x^{2020}}{y^{2020}}\) ?

17. What is the least positive integer \(n\) such that \(1 + 2 + 3+… + n > 100\)?

18. What is the units digit of 7^7?

19. The absolute value of \(x\) always represents the positive value, that is, \(|-2| = 2\) and \(|3| = 3\). Determine the value of
\(\frac{|-7|+|7|+|-2|}{|3| + |-4| + |3-4|}\)

20. Find the value of \(1^2 + 2^2 + 3^2 + … + 28^2 + 29^2 + 30^2.\)