75 points !!Classify the following reactions as to SYNTHESIS, DECOMPOSITION, COMBUSTION, SINGLE REPLACEMENT or DOUBLE REPLACEMENT reactions: N2 (g) + 3 H2 (g)→ 2NH3 (l)

2 H2(g) + O2(g--> 2 H2O(g)

CaCO3(s) → CaO(s) + CO2(g)

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

I am a kid I can't answer

Explanation:

Pluriel you don't have a lot more of your stuff in

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.