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R0056-28645 · q-20261005-advance-20261006-r03-rate-of-change-0045
The proposed permitted endpoint inputs are x0=-19 and x1=-38. Is their difference a valid nonzero denominator for an average rate of change?
G001 — The proposed permitted endpoint inputs are x0=-19 and x1=-38. Is their difference a valid nonzero denominator for an average rate of change?Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.
Before
source roles = [qf-rate-denominator-validity, denominator_validity]
After
derived = [distinct_endpoint_eligibility]
Conditions: none
Use the declared scalar/set/Yes-No/fraction answer role;integer fractions retain/1.Do not add an undeclared domain or change original bilingual data,formulas or questions.
Rule: R56_source_answer_role_and_EXACT_family_interface · Uses: G001
Before
Rate ORIGINAL x1 minus x0 := sub(-38, -19)
After
Rate ORIGINAL x1 minus x0 = -19
Conditions: none
Perform exact rational arithmetic on the ORIGINAL roles.SAFE bounds raw inputs only;derived integers are unbounded and never approximated by floats.
Rule: exact_rational_arithmetic · Uses: G001, S001
Before
source roles = [-19, -38, -19]
After
derived = [Yes, Yes]
Conditions: none
The average rate requires x1-x0 nonzero.Equal endpoints are a legal No eligibility case;do not compute0/0 or repair the endpoints.
Rule: Rate_equal_endpoints_legal_eligibility_NO_division · Uses: G001, S002
S003 · premise_and_result_audit — Reverse-check EACH original datum and premise,retaining indices,signs and strict/non-strict boundaries.A correct final answer cannot replace the derivation obligations.This is candidate teaching/exact checking,not formal proof or publication clearance.S002 · premise_and_result_audit — Recompute Rate ORIGINAL x1 minus x0 with exact rational arithmetic, not rounded decimals.S001 · premise_and_result_audit — Reverse-check EACH original datum and premise,retaining indices,signs and strict/non-strict boundaries.A correct final answer cannot replace the derivation obligations.This is candidate teaching/exact checking,not formal proof or publication clearance.Yes
The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.
Review date: 2026-10-26
Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.
input commit: 0f7be61e2c22317a4075561dc822c87d881a50dboriginal question SHA-256: 0ba4c9eb909934d61e5f4feefe418d694b68e2375b75714670d769d6d956d88acandidate record SHA-256: 171d4faa5f6e96ce61874e730303da705abab73bd4cdb23665f3d5aaf84f9057semantic review receipt SHA-256: 8bbda4edbed7078634ae88342998c79bcfb95de96187fac119c3b08e0adb0bc8question-first witness SHA-256: 3edafa72d63d16a22414892b55806430e0a25b15b926d04f312550179607759fLean: NOT_RUN · human review: NOT_PERFORMED