1. farmer brown has four fields that can produce corn or tobacco. assume that the trade-off between corn and tobacco within each field is constant. the maximum yields are given in this table:

field a b c d
corn 40 40 30 10
tobacco 10 40 20 30

a. draw farmer brown's production possibility frontier

Field          A     B   C     D
Corn         40   40  30  10
Tobacco  10   40  20  30

Production possibility frontier is defined as a curve depicting all maximum output possibilities for two goods, given a set of inputs consisting of resources and other factors. The PPF assumes that all inputs are used efficiently. 

In the PPF, Corn data is represented by the y-axis, Tobacco data is represented in the x-axis. I simply inputted the points but didn't make the curve because there is a point that seem to go beyond the curve. Please see attachment.