Which economic policy of the 1920s resulted in lower taxes?
a. emergency tariff of 1921
b. kellogg-briand pact
c. washington disarmament conference
d. revenue act of 1924

What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? they created the scientific method to outline how science should be conducted. they were able to find the orbit of a comet and predict the year of its return. they discovered the three newest planets--uranus, neptune, and pluto. they explained why objects appear to have color.