MBA Exam

If 3x+5y = 18, and the expresssion x^4 * y^2 has its max value the the value of y is (x,y > 0)Plz post the approach

1) 1
2) 1/4
3) 6
4) 5/6
5) 6/5

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MBA Other Question
All the natural numbers which are multiples of 7 are written one beside the other. What will be the 5000th digit? (share approach)

1) 9
2) 8
3) 2
4) 5
 If 2x+3y=10 and y<4, then which of the following options is correct?According to me, x>-1 should be correct. But the question says x>0 is correct.

1) x>-1
2) x<-1
3) x>0
4) x<0