Hey there!
[tex]\bold{5(3+7)}\\\bold{3(3)+5(7)}\\\bold{5(3)=15}\\\bold{5(7)=35}\\\bold{15+35=50}\\\\\boxed{\boxed{\bold{Answer: \underline{50}}}}\huge\checkmark[/tex]
Good luck on your assignment and enjoy your day!
~[tex]\frak{LoveYourselfFirst:)}[/tex]