The sum of 4 times a number and 5 equals 6

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

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?

Which system of linear inequalities is represented by the graph?