Please answer asap!!! Thank you so much

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Given vec(a))=(:2,-2,3:), vec(b))=(1,3,4), vec(c))=(3,6,4)(a){:[ bar(a)xx vec(b)=|[i,j,k],[2,-2,3],[1,3,4]|=i[-8-9]-j[8-3]+k[6+2]],[=-17 i-5j+8k]:}{:[:.((( vec(a))xx(( vec(b)))xx( vec(c)))=|[i,j,k],[-17,-5,8],[3,6,4]|:}=i[-20-48]-j(-68-24)+k[-102+15]],[=-68 i+92 j-87 k],[=(:-68","92","-87:)]:}ry{:[( bar(a)xx( bar(5))* bar(c))=(-17","-5","8)*(3","6","4)],[=(-17)(3)+(-5 ... See the full answer