book Maths Puzzle Numerical Ability

The sum of 5 and a negative integer is greater than -4 and less than 0. How many possible negative intergers satisfy the information?

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book Other Question

I am not sure how to solve this problem: (-3y2)2 I think it is 9y4. Is that right? I really appreciate your help! Robin DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0