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5, 13 and 17 are prime.
% of correct answers = 84%=(25 - 4)/25 * 100%=21/25 * 100%= 84%
no.Matt says:For starters this open Q is badly written and the second part makes no sense in its current state!!Do you mean: a) "What is the large number and is it divisible?"OR b) "Which number is the large number divisible by?"OR c) "Is the large number divisible by 21?"Next whomever answered this first should not be trusted to answer Q's as not only did they NOT really answer the Q but they are WRONG!The Q states "the number is even", so it IS divisible by 2 at least.If the Q was in fact c) then (being an open question), here are some of the infinate answers:399, 3+9+9=21, 399/21=19, but it's not even.588, 5+8+8=21, 588/21=28777, 7+7+7=21, 777/21=37 not even.966, 9+6+6=21, 966/21=461596, 1+5+9+6=21, 1596/21=761659, 1+6+5+9=21, 1659/21=79 not even.1785, 1+7+8+5=21, 1785/21=85 odd1848, 1+8+4+8=21, 1848/21=881974, 1+9+7+4=21, 1974/21=942289, 2+2+8+9=21, 2289/21=109 odd.... and so on. ps I hate open questions!
3 is a factor of 21 and it is not a multiple of 7.
The greatest common factor of 21 and 63 is 21.Since 21 is a factor of 63, it is automatically the GCF.