What is the square root of 53 rounded to the tenth?

What is the slope of the equation y =

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?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)