book Maths Puzzle Numerical Ability

how would you solve a problem like -x(3/7+y)

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book Other Question

Evaluate the expression: 3.2-3/5

I am lost with the "-" sign

Thanks for your help im trying to figure out what i need to make on my last exam to get a 77 as my final grade. my first 3 exams i got an 82, a 60, and an 80. Each are 24% of my grade. The last exam is