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!