Question

What are the three means between 10 and 2,560?
Select one:
a. 40, 160, 640
b. -40, 160, 640
c. ±40, ±160, ±640
d. None of the above

Answer 1

@johnweldon1993

Answer 2

which mean you are talking about
arithmatic geomatric or ......????

Answer 3

generally mean of a & b
= (a+b)/2

Answer 4

Geometric means based on your last questions? If so, lets use the formula

\[\large tn = t_1r^{n - 1}\]

\(\large t_n\) would be the 2560
\(\large t_1\) is the 10 you have
\(\large n\) would be 5

\[\large 2560 = 10(r^{5 - 1})\]

So lets divide by 10
\[\large 256 = r^4\]
\[\large r = \pm 4\]

We can use that to solve for the other means...

start with 6 and multiply it by 4..then continue to multiply the results by 4 until you get to 2560

we will also have 2 sets of means here (notice the \(\large \pm4\))

so we also need to multiply the 6 by -4...then do the same multiplying the results you get by -4 until you get to 2560

Answer 5

Would it be c....

Answer 6

sorry meant starting with 10... and multipying by 4 and -4 lol:P

Answer 7

so lets see

10 times 4 = 40..times 4 = 160 times 4 = 640

and

10 times -4 = -40 times -4 = 160 times -4 = -640

so the list will either look like

\[\large 40 , 160 , 640\]
or
\[\large -40, 160, -640\]

Answer 8

So it must be A then right? 40,160,640..

Answer 9

Correct, sorry about that lol