I had 8 tampons this morning but 2/3 of the girls in my class got their period and now I’m out of tampons
Answer:
A. 
Step-by-step explanation:
I graphed my answer on the graph below and it matches your graph.
A
Hopefully I did the math right
Is the all of the problem
Answer:
The value is 
Step-by-step explanation:
Generally the productivity rate is mathematically represented as

Here K is the ha the farmer could harvest in an hour and Z is a typical yield of corn in kg/ha
Now considering 1970
The productivity rate is

=>
Now considering 1940
The productivity rate is given as
Generally the productivity ratio is mathematically ration is mathematically represented as

=> 
=> 