book Maths Puzzle Numerical Ability

-10 + (+3)=
The answers are....7, -13, -7, 13.
Thank you for the help.

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morgan company recieved from lee co an invoice dated 9/27 terms were 2/10 EOM. List price on the invoice was 5,000 freight not included. Morgan recieves a 9/7 chain discount. Fr how do i transform te equation y=x�+6x+3 into the the standard equation
y=a(x-h)�+k