How do you balance Co(s)+Cl2(g)?
I keep getting this incorrect: 2Co(s)+3Cl2(g)-> 2CoCl3

Explanation:

Cobalt either has two or 4 as it's valance number == usually 2

Co + Cl2 ==) CoCl2 and that balances it.

I was quite surprised to find out that that Cl3+ actually does exist, but I'm pretty sure only in a grade level about yours. It sort of looks like this

Co3+  + 1e- ===> Co2+

If there was a Co3+ ion, your equation would be correct the way it is done. That's why I went to check it.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

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.