33. 1 34.
Practice the Skills
In Exercises 7-24, answer true or false. If false, give the
reason.
7. gold < (gold, silver, sapphire, emerald)
8. { } E {knee, ankle, shoulder, hip}
9. { } {Tigger, Pooh, Christopher Robin}
10. red C {red, green, blue}
11.5€ {2, 4, 6)
12. {Pete, Mike, Amy} {Amy, Kaitlyn, Brianna
13. { } = {0}
14. (engineer} <{architect, physician, attorney, engineer}
15.0 = { }
16. 0 = { }​

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

During your cycling trip, you and your friends often stayed in hostels. the prices of these are listed below. hostel standard room (price per night) with breakfast (price per night) super sleep hostels £22.45 £28.65 normandy nights £18.55 £25 zzzola hostels £24.50 £30.99 belgian beds £11.20 £18.55 night-time rest days ? £33 what is the range in cost for a single night, including both standard room prices and with breakfast prices?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.