JUST NEED U TO SEE M What would we need to start a colony on Mars?
My ideas are soil, trees, and plants, water, those plant heat lamps, airtight domes, solar panels, and rocket fuel.
Any more stuff we need to pack???
(I mean global warming and all)

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?