Consider the following chemical equation: NH3 + 02 - NO + H20
The equation is unbalanced. Which of the following is the correct balanced equation?
OA NH3 + 202 -- NO + 6H20
О В. 4NH3 +502 - ANO + H20
OC 4NH3 - 502 - ANO 6H20
OD. NH3 +502 -- NO + 6H20

4NH3 + 5O2 → 4NO + 6H2O

Step-by-step explanation:

4NH3 + 5O2 → 4NO + 6H2O

Equal number of reactants and products,

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°