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, 2000

Algebra Difficulty 1.0 Junior Find the answer Canada

A student uses a calculator to find an answer but instead of pressing the $x^2$ key presses the $\sqrt{x}$ key by mistake. The student's answer was 9. What should the answer have been?

(A) $243$ (B) $81$ (C) $729$ (D) $3$ (E) $6561$

Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.