a student weighing 490 N stands on a spring scale on earth. what is the students mass(gravity is 9.8 m/s

Mass, m of the student is 50kg.

Explanation:

Given the following data;

Weight of student = 490N

Acceleration due to gravity = 9.8m/s

Weight is the product of the mass of an object or body multiplied by gravity.

Mathematically, weight is;

Where;

W represents the weight of a body measured in Newton.

m represents the mass of a body measured in kilograms.

a represents acceleration due to gravity measured in metre per seconds.

Mass, m = 50kg.

Therefore, the mass of the student is 50kg.

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