Can someone please help ill make you brainliest you dont even have to answer all of them

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

Find the solutions for a triangle with a =16, c =12, and b = 63º

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup