Question

Write an expression for the general or nth term, an, for the geometric sequence. 1, -4, 16, -64, . . .

A. an = 1 • (-4) n-1

B. an = 1 • (-4)n

C. an = 1 • 4n-1

D. an = -1 • 4n

Answer 1

the n , n-1 at the end is a power of 4,-4 right ?

Answer 2

answer is B :) lol

Answer 3

its not B ..

Answer 4

its A

Answer 5

in order to find the solution you have to substitute n=1,2 in the equations and see what fit

Answer 6

its b. plug 1 into A. you get -5. it isnt a power. that would be ^1

Answer 7

michael0195 n-1 is a power of (-4)

Answer 8

no its multiplying :) to make a power it would be (-4) ^n-1 there is no "^" its not a power :)

Answer 9

if its a multiplication then non of the answers is correct.. plug n =2 into your favorite b and get -8

Answer 10

there is no 2 in the sequesnt
the sequence is 1, -4, 16, -64. plug those numbers into B and oyu get the next number in the sequence :)

Answer 11

sequence*

Answer 12

so its B?

Answer 13

but the numbers you plug for n are 1,2,3,4,.....

Answer 14

NO! its A

Answer 15

im so confused

Answer 16

why would they be 1,2,3,4 when it gives you the sequence in the question?

Answer 17

mollyann please tell us if for exmaple in A
the n-1 is a power of (-4) ?

Answer 18

\[A. an = 1 * (-4)^{n-1}\]

Answer 19

does A looks like this ?

Answer 20

yes

Answer 21

A is the correct answer

Answer 22

and michael .. n represents natural number .. any natural number
so n =1,2,3,4....

Answer 23

for n =1 you should get 1
n = 2 you should get -4
and so ..

Answer 24

in the future if there is superscript thats like raised as an exponent, you gotta type the carrot top "^" to tell us it is! lol

Answer 25

whatever .-.

Answer 26

or answer these question i cant figure them out :/ and i need A on this test or i fail ):

Answer 27

Express the repeating decimal number as a quotient of two integers.

28.81

A . 3125 over 11

B. 83 over 11

C. 317 over 11

D. 5 over 52

Answer 28

x = 0.81 (repeating)
so
100x = 81.81 (repeating)
and so
100x -x = 81.81 - 0.81 (repeating)
100x -x = 81
so:
99x = 81
x = 81/99
x= 9/11

28 + (9/11) = (28 * 11 + 9) / 11 = (308 +9) / 11 = 317 / 11

Answer 29

thank u

Answer 30

yw