Please help with my 3 parallel & perpendicular questions ;p please list like 1., 2., 3. <33

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

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

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?