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

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?