Please help asap i’m not sure! i’ll mark brainlest

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

Select the two pairs of figures that are similar.