Which line has a constant of proportionality between yyy and xxx of 555?

I’m an electrically neutral atomic any element, there are equal numbers of

Which substance can be broken down by chemical means

While in europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car’s gas mileage is 32.0 mi/gal? assume that 1 euro=1.26 dollars