exam Maths Puzzle Numerical Ability

i have a test tomorrow and im strugling can u help solve this question on my review

7n+2[3(l-n)-2(1+n)=14

another question is -10+4(3p+10)=18

one more is 66=-6/5(s+3)

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exam Other Question

If 5 apples in a barrel of 25 apples are rotten, what is the expected number of rotten apples in a random sample of 2 apples? Express using a positive exponent.

1/y^-7 This is supposed to look like a fraction with a negative exponent.