10) The 2 main characters in Les Miserables are Val Jean and Javert. Twenty-four men audition
for these 2 parts. In how many ways can the parts be chosen?

Carter drank 15.75 gallons of water in 4 weeks. he drank the same amount of water each day. a. estimate how many gallons he drank in one day. b. estimate how many gallons he drank in one week. c. about how many days altogether will it take him to drink 20 gallons?

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?