Hey there!
[tex]\bold{-15-9-(-7)=?}\\ \bold{-15-9 = -24}\\ \bold{-24-(-17) =?}\\ \bold{negative (-) \& negative (-) = positive (+)}\\ \bold{-24+7=-17}\\ \\ \\ \\ \boxed{\boxed{\bold{Answer: -17}}}\huge\checkmark[/tex]
Good luck on your assignment and enjoy your day!
~[tex]\frak{LoveYourselfFirst:)}[/tex]
