A battery sends a current through a metal wire. The current in a wire is 3.7 A.
Calculate the charge that flows into the wire in 13 s

none, its a machine

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form