Ramon earns $1,800 each month and pays $53.60 on electricity. To the nearest tenth of a percent, what percent of Ramon's earnings are spent on electricity each month?
Ramon spends _% of his eamings on electricity each month.

3%

Step-by-step explanation:

So in the most basic form, this question is asking what percent of $1,800 is $53.60. To find the percentage, we are simply going to divide both numbers then multiply by 100.

I'd like to add that by multiplying by 100, we change the number to a percentage. If we were to skip this step, it would just be a small decimal and not in the correct format needed for the answer.  

= (53.60/1800) x 100

= (0.02977777777) x 100

= 2.97777777778%

All that is left is to round to the tenths place

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.

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8