Solve the following: 1. Find the ratio of price of pens to that of pencils when pens cost 50
for 2 pens and pencils costs * 72 for one dozen,

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.

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