book Maths Puzzle Numerical Ability

Can someone help me with this problem?

A school had 900 students at the start of a school year. If there is an enrollment increase of 7% by the beginning of the next year, what is the new enrollment?
Thanks,
Lyn

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book Other Question
Hello. THe problem states add or subtract and the problem itself is
9i + (-9 - i). I have come up with -9+8i as a solution. Could you please tell me if this is correct and if not, where I messed up. Thanks in advance. What does M equal in algebra ?