Section P.1 Check Point Exercises 1. 2 2 8 6( 3) 8 6(13 3)     x 2 8 6(10) 8 6(100) 8 600 608        2. Since 2015 is 15 years after 2000, substitute 15 for x. 2 2 4 341 3194 4(15) 341(15) 3194 9209 Tx x      If trends continue, the tuition and fees will be $9209. 3. The elements common to {3, 4, 5, 6, 7} and {3, 7, 8, 9} are 3 and 7. {3,4,5,6,7} {3,7,8,9} {3,7}   4. The union is the set containing all the elements of either set. {3,4,5,6,7} {3,7,8,9} {3,4,5,6,7,8,9}   5. 9, 1.3, 0, 0.3, , 9, 10 2   π       a. Natural numbers: 9 because 9 3  b. Whole numbers: 0, 9 c. Integers: 9, 0, 9 d. Rational numbers:   9, 1.3, 0, 0.3, 9 e. Irrational numbers: , 10 2 π f. Real numbers: 9, 1.3, 0, 0.3, , 9, 10 2 π   6. a. 1 2  Because 2 1.4,  the number inside the absolute value bars is negative. The absolute value of x when x < 0>