PLEASE HURRY ITS MY LAST QUESTION ON MY HW AND I CANT FIGURE IT OUT

As a satellite moves away from Earth, the strength of Earth’s gravity is BEST represented by
A) A
B) B
C) C
D) D

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Which is not true about oxygen-17 and oxygen-18?