3. Rayanna was asked to write the equation for the synthesis of magnesium oxide. Knowing that all chemical reactions are governed by the law of conservation of mass, she writes the following chemical reaction: Mg(s) + 0,(8) ► Mg0,(s) Do you agree with her chemical equation? Justify your answer. [4 marks]

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

answer; natural resources;