[bug] MATH grader: unboxed 10^{3} extracts the exponent — grades as 3 not 1000

[marktech0813]

Problem

Unboxed integer powers are common final answers. Extract reads only the exponent digit:

extract_last_number(r"$10^{3}$")  # "3"
score_text("math500", r"$10^{3}$", "3")     # 1.0  FALSE POSITIVE
score_text("math500", r"$10^{3}$", "1000")  # 0.0  FALSE NEGATIVE
score_text("math500", r"\boxed{10^{3}}", "1000")  # 1.0  (boxed path works)

Sibling of #436 (1e3) and #485 (3\times 10^{2}).

Expected

Unboxed 10^{3} / 10^3 extracts as one term and grades equal to 1000, not 3.

Environment

• origin/main

[github-actions]

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