8.3+due+2-3

2) 3,12,48,192,... = geometric sequence ratio= 4 4) 1,-2,4,-8,... = geometric sequence ratio= -2 6) 5,1,0.2,0.04,... = geometric sequence ratio= .2 8) 9,-6,4,-8/3,... = geometric sequence ratio= -.66666666667 10) 1/5,2/7,3/9,4/11,... = not a geometric sequence


 * 1) 2-10 done by Emma McRae

I agree with Emma! checked by Kelsey Harmon

I agree with Peter!! - Shannon Wissel Peter Radecki 12,16,18 12) a1=4 r=2 an=a1xrn-1 A2=4x2^(2-1)  4x2  8  A3=4x2^(3-1)  4x2^2  4x4  16  A4=4x2^(4-1)  4x2^3  4x8  32  A5=4x2^(5-1)  4x2^4  4x16  64  16)a1=6 r=-1/4 A2=6x-1/4^(2-1) 6x-1/4 -6/4=-3/2 A3=6x-1/4^(3-1) 6x-1/4^2 6x1/16 6/16=3/8 A4=6x=-1/4^(4-1) 6x-1/4^3 6x-1/64 -6/64=-3/32 A5=6x-1/4^(5-1) 6x-1/4^4 6x1/256 6/256=3/128 18)a1=4 r=3^1/2  A2=4x(3^1/2)^(2-1)  4x(3^1/2)^1  4x3^1/2  4√3  A3=4x(3^1/2)^(3-1)  4x(3^1/2)^2  4x3  12  A4=4x(3^1/2)^(4-1)  4x(3^1/2)^3  4x3^3/2  4√27  A5=4x(3^1/2)^(5-1)  4x(3^1/2)^4  4x3^2  4x9  36

20. a1= 81 a2= 27 a3= 9 a4= 3 a5= 1 r= 1/3 an= 81*(1/3)^n-1

22. a1=5 a2= -15 a3= 45 a4= -135 a5= 405 r= -3 an= 5*(-3)^n-1

24. a1=30 a2= -20 a3= 40/3 a4= -80/9 a5= 160/27 r= -2/3 an= 30*(-2/3)^n-1

-done by Brooke Wiggins

I agree with Brooke -Preston Wall

26. a1=5 r = 3/2 n=8 an=5(3/2^8-1) a8= 85.429

28.a1=8 r= _3/4 n=9 an=8(-3/4^9-1) a9=.801

30.a1=1000 r=1.005 n=11 an=1000(1.005^11-1) a11=1051.140

I got 85.430 because you round up from 85.4296; i agree with 28 and 30. -Blake Schreiber
 * 26,28,30 Done by: Valeria Chelala



Done by: Valerie Finstad

Snap. I agree with 36, and 38, but for 42, don't you have to do that formula four times with 1-4 plugged in for n? I got S1=8, S2=20, S3=38, and S4=65. Checked by: Quinn Chippewa Taylor

Whoever was supposed to do it did not put up their work so here is mine. Done by: Alyssa Sturgis 52 & 54 For some reason on #54, I'm pretty sure I set it up right, but the calculator kept giving me 3949.15, like I put as the answer, and the equation kept giving me 3449.15, so I just put 3949.15. Done by Ellen Barth Checked by: Sung Yoo

Check 52&54) I got the same answer on number 52, but on 54 a1 is just 500 b/c u do the first term which is a0, and n=7 not 6 b/c it starts at 0. the calculator version is right, and the changes will give you the same answer in the equation. Checked by Matt Chippewa Milan Victorious Secret > Chippelosers Done by Justin Chippewa Ivins correct checked by parker tennet

Done by: Amy Finkelstein I got the same answers but on numbers 60, 62, and 64 i put that there was no sum because the absolute value of the answer is greater than one. Checked by: Alyssa Johnson

76. .08/(1-.1) = .08/.9 + 1.3 = 25/18 80. a1 = 50(1+(.08/12)^1 = 50.333 a2 = 50(1 + (.08/12)^2 = 50.669 50.669/50.333 = 1.00666 50.333(1-1.00666^60)/(1-1.00666) = 3697.540 91. .01(1-2^29)/(1-2) a29 = 5368709.11 a30 = 2xa29 = 1073718.22 a31 = 2xa30 = 21474836.44 Done by Alex Dubois-srry for the late update, im pretty sure these were the ones im supposed to do and uploaded the wrong ones since no one else posted those either

The person who was supposed to answer questions 76, 80, and 91 did not do so, and I was unable to check them. Sam Bennack

Tehee!