Difference between determine and decide

[Guest]

Test No. incompl/advan-26 "Agreements", question 10

We decided to employ a solicitor who would be able to ......... the extent of our liability in this matter.

(a) decipher
(b) decide
(c) defer
(d) determine

Test No. incompl/advan-26 "Agreements", answer 10

We decided to employ a solicitor who would be able to determine the extent of our liability in this matter.

Correct answer: (d) determine

Your answer was: incorrect
We decided to employ a solicitor who would be able to decide the extent of our liability in this matter.
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why "determine"? Ok, apart from repetition which I am just detecting "decide" is not so nice.

[Alan]

Here we need a verb meaning calculate/work out and not make a decision.
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English as a Second Language
You can read my ESL story Adverbs