Help me please I don’t understand eee

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

The transitive property of equality states that: o if a = b, then bra o if a = b, then ac = bc o if a = b and b= c, then a = if a = b and c= c, then a + b = b + c

Simply 8x squared + 5(7x squared- x) - 2x =