Jill and bill each rounded 2,639,456 to the nearest ten-thousand. bill got 2,640,000. jill got 2,630,000. who is correct? what was the error?

Bill is correct. Jill is incorrect.
Jill's error is that she didn't take into account the 9 in the thousands place, so she didn't round the 3 in the ten-thousands place up to a 4, like Bill did.

The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.