What was the primary motivation for the drawing of lake beds in Mexico City ?
A to reduce the risk of fooding
B to prevent the spread of diseases
C to protect the city from invaders
D omine for gold under the lake beds

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor.b. increased mechanization has increased the need for water, thereby increasing the need for labor.increased mechanization has increased the use of land, thereby increasing the need for labor.d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.

Solve for r in the formula v = ir, when i = 5 and v = 15.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4