5d - 13 < 32. i don't understand it . i need .

5d<32+13

5d<45

D<9

Just simplify as much as you can.

So it is asking if 5d-13 is less than 32. so what you do is look at the < sighn. that sign means that 5d-13 is less than 32 so an easy way to remember that is to think of it like Pac-Man. the less fat and more hungry pacman < will eat the bigger more full pacman> so in this problem it is most likely asking if this is true