30 14 10. Express ;-; as a single sum. i=1 i=1 11 Let ₁ = 2, x = -5, x3 = 4, x4 =-8; 1 =-3, y2=-8, 93 = 10, 94 = 6. Calculate (α) Στ (0) Στ; (d) Στ., (e) (Στ) Problems 12-23 are for a TI-83. In Problems 12 and 13, write the first 3 and last 3 elements of the list. 12. seq(5X+2,X,10,200) 13. 10seq(X,X,13,190)+5 In Problems 14 and 15, write a formula for the sum (a) using sigma notation with the given index, (b) 83, and (c) calculate the answer exactly. 14. 72 +82 +53², index k 15* 100 terms of 1) + 2)²+3(3)3+, index In Problems 16-21, write a TI-83 formula and evaluate the expression to 6 digits. 16. √7.2 +3.5(2.6)4 19. + 1+√√2 1+√√3 17. 1 4.7+3.6 20. 1.22.30.86 In Problems 22 and 23, solve the system using rref. 22. .517x+.746y=.423 .290x+.466y= .628 18. 17.5-1.3 21. (√√2-3)3/5 23º 10.2x+14.6y=21.3 4.5x+1.1y44.8 3. Σε 2 × 10-11-292 5.1+2x+3x+4x³ + (k-1)+-+- 9.a 83,d -2,n 40,s=1760 11. (a)-7 (b) 1440 (c) 26 (d) 109 (e) 49 Problems 1.4 Introduction to Technology 1.4-4-4-12+36 7.(1)(b)(-1 15. (135,145,155,..., 1885, 1895, 1905} 17.1/(4.7+3.6(1+ √(2))) = 0.0374098 23.x 11.5758,y=-6.6283 = 13. (a) (b) sum(seq(X²,X,7,53)) (c) 50948 19.-1/(1+ √(2)) + 1/(1+ √(3)) = 0.780239 21. (√(2)-3)^(3/5)=-1.31870