Answer:
The prices of the 2 stocks will be the same at 13.6 hours
Explanation:
Write 2 equations with the given information:
y = 0.07(x - 9) + 15.53
y = -0.11(x - 12) + 16.03
y is price and x is time
Find where they intersect:
0.07(x - 9) + 15.53 = -0.11(x - 12) + 16.03
0.07x - 0.63 + 15.53 = -0.11x + 1.32 + 16.03
0.07x + 14.9 = -0.11x + 16.35
0.18x = 2.45
x = 13.6
The prices of the 2 stocks will be the same at 13.6 hours