Answer:
Step-by-step explanation:
Average rate equals the negative of delta concentration of reactants
B. -4x+5y=40
y * 5= (4/5 x + 8) * 5
5y = 4x + 40
-4x + 5y =40
First digit 2,3,4,5 = 4 different digits.
Second digit 2,3,4,5 = 4 different digits.
Third digit = 1,2,3,6,7,9 = 6 different digits.
Total number of possibilities = 4*4*6 = 96
30
(-) (-) = +
Therefore 15 - (-15) = 15 + 15 = 30
