book Maths Puzzle Numerical Ability

when subtracting two negative numbers do u add or subtract ex. -24-(-54)

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book Other Question

One day in math class, shelley ask the teacher, " Mr. Nelson, how old are you?"
Mr.Nelson responds: "This year Iam 3 times as ols as my sister. How ever. 6 years ago, I was five times as old as she was". How old is the math teacher? Please help solve into a graphable solution
y(a)=1000x(0.97)^x