Question

What is the 41st term of the arithmetic sequence where a1 = 17 and a15 = -39 ?

Answer 1

@eliassaab : What is the 7th term of the geometric sequence where a1 = -4,096 and a4 = 64?

Answer 2

r = 64

Answer 3

\[-39=14 r+17
r=-4

\]
for the first problem

Answer 4

\[-39=14 r+17\\
r=-4

\]

Answer 5

my choices for that one are: A) -147
B) -143
C) -139
D) -135

Answer 6

a41=17+ 40 (-4)=-143

Answer 7

thats what i got.

Answer 8

Excellent

Answer 9

A) -1
B) 4
C) 1
D) -4

options for the second one... i got D

Answer 10

It is A.

Answer 11

Are you sure a1 isn't 4096?

Answer 12

okay, i'll work it again.

Answer 13

@telliott99 i'm sure . its -

Answer 14

-4096 r^3 =64 this gives r = -1/4
-4096(-1/4)^6= -1

Answer 15

i got -1 :)

Answer 16

Excellent

Answer 17

I see, sorry to cause confusion.

Answer 18

-4096
1024
-256
64
-16
4
-1