section 11.1#10

For problem 10 i do not understand how to complete it. I plugged (0,0) into
the equation and I got the first answer 140. after that I attempted to plug
in (1,1) which did not work, (.4,0) with the same result, and then trying
to subtract 10 from 140 since it said it was spaced by 10 but still no
answer.

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This is interesting....I spoke to another student about this problem earlier gave the wrong answer.  OK,  on the line at y=0, the function f(x,0)=140e^x which is increasing with x so since they are equally spaced multiples of 10,  f(.4,0)=140e^.4=140*1.49 which is approximately 210--which should be =B. The gap between the contours thus should be 70, so that C=280 and D=350