book Maths Puzzle Numerical Ability

Help me please find the term of the expansion (x-y)^8 that contains y^7 and simplify it. Thank you so much!

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Can someone help me?
Seven employees of an office donated a total of $172.06 during a charity drive. What was the average donation?
Lyn Hi,can you please explain in detail and help solve these?

X:9^x=3

x:2^9x-4=32

4 ___
Express as a product: log 3 /x

Thank you so much!
Jackee