Afamily has two cars. during one particular week, the first car consumed 30 gallons of gas and the second consumed 40 gallons of gas. the two cars drove a combined total of 1800 miles, and the sum of their fuel efficiencies was 50 miles per gallon. what were the fuel efficiencies of each of the cars that week?

10 points? ? +++ me asap gabriella uses the current exchange rate to write the function, h(x), where x is the number of u.s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a) gabriella averages 7.5 u.s. dollars for every 100 euros. b) gabriella averages 100 u.s. dollars for every 25 euros. c) gabriella can exchange 75 u.s. dollars for 100 euros. d) gabriella can exchange 100 u.s. dollars for 75 euros.