book Maths Puzzle Numerical Ability

solve the inequality symbolically. Express the solution set in interval notation.

7y-2<-6y-7

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book Other Question

Dave Salcedo has $40,000 to invest. He invests part of it at 5%, one-fourth of this amount at 6%, and the rest of the money at 7%. His total annual interest income is $2,530. Fin I need to solve this log problem:

1) log( 8, (n-3)) + log( 8 (n + 4)) =1

I believe that the "logs" cancel out because they both have the same base. Then I dont understandwhat to do from there