Pheobe has 9 rocks. she puts the rocks into 3 boxes. each box 1 more rock then the last. how many rocks are in each box

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Ineed with number 6 , explain how to get 1978

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.