Answer:
MR(x) = 0.1374x+1.3014
Step-by-step explanation:
The question is incomplete. However, it is about the calculation of marginal revenue from the equation of revenue. The equation of revenue is shown below:

The marginal revenue is determined from the derivative of the revenue. Therefore, we have:
Marginal revenue [MR(x)] =
= 0.0687*2x+1.3014
Thus:
MR(x) = 0.1374x+1.3014
If x = 500,000,000 bushels,
MR = 0.1374*500+1.3014 = 70.0014