There are approximately 1.2•10 to the 8th power households in the US. If the average household uses 400 gallons of water each day, what is the total number of gallons of water used by the households in the US each day ? In scientific notation

the answers are in the images, i received 100% on this assignment. hope this !

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft

4n=2m

ratio of m to n: 2/4 = 1/2

answer

a. 1/2