Step-by-step explanation:
simply the first one.
-9x -6y = 39 is nothing else than
3x + 2x = -13 multiplied by -3
which leaves the values and solutions unchanged, as we could simply divide by -3 again and end up with the original system and its solution.
53) Vertical angles are congruent, so 
54) 
and 
are supplementary, so 
55) Because vertical angles are congruent, 
. Now, because DR bisects 
, this means 
56) This is a geometric sequence where the next term is obtained by multiplying the previous term by -2, so the next two numbers are 16, -32
The length of the wall will be 25 feet less than how long it was on day one.
You have to multiply both numbers. Since he can tear down 5 feet in one day, you would express that as 5x1. In 5 days, you would do 5x5 which gives you 25 feet. Hope this helped!
