Answer:
420
Step-by-step explanation:
if we add 30 to each of the length of speech, we get 420 seconds
there would be a 14 percent chance of you or your friend winning
0.1
-3(x+2)-7 = 5x + 7
-3x - 6 - 7 = 5x + 7
-3x - 13 = 5x + 7
-20 = 8x
x = -2.5
