The Bedrock water department has a monthly service charge of $12.30 and a volume charge of $1.70 for every 100 cubic feet of water. Which of the following equations can be used to determine the Sandstone family's monthly water bill? (Let x represent 100 cubic feet of water and y represent the monthly cost.)

The equation 1.70x + 12.30y = c could be an expression that represents this situation because the expression above states that $1.70 for every 100 cubic feet of water plus the service charge of $12.30 per month will equal the total cost, c.

y = 1.7x + 12.30

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.