Question

Please help with number 12 with part A,B and C

Answer 1

when you simplify the first site it equals -16x*2+320x
the second site equals -16x*2+320x+200

both problems are representing the time after launching the fireworks.

x y x y
9 | 1784 9 | 1584
10| 1800 10 | 1600
11| 1784 11 | 1584

so both sites meet at 10, hope this helps!