book Maths Puzzle Numerical Ability

Evaluate the expression: 3.2-3/5

I am lost with the "-" sign

Thanks for your help

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book Other Question

Could some one help me understand this problem?

The instructions are to solve the inequality. Find the vertex and intercepts, then graph it:
y = -x^2 - 3x - 2

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