I need help ASAP. This is for 15 points

the Prime Meridian is the planets line of 0 degrees longitude sometimes called the Greenwich Meridian or the international Meridian

the great circle of Earth with the latitude of 0 degrees

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

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.