Please help! *this is grade 8 math*

1. how to solve systems of linear inequalities in two variables by graphing?

2. What are the steps in solving word problems involving systems of linear inequalities in two variables by graphing?

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.