What type of reaction is Cl2 + 2KBr = Br2 + 2KCl?

Single Displacement Reaction

Explanation: For this reaction Chlorine atom displaces Bromine and Cl pairs up with Potassium K. The generic form of the reaction can also be expressed in the following form:

A + BC => C + AB

the answer is either b or c

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.