Ineed !
khalid wrote the sequence below.
x-1, -2x+2, 4x-4, -8x+8
which formula can be used to find the 10th term of the sequence?
a.
b.
c.
d.

The given sequence is x-1, -2x+2, 4x-4, -8x+8 .

Notice that this is a geometric sequence because here we have equal common ratio.

So, common ratio : r =

=

= Take out -2 as common factor

= -2 Cancel out x - 1.

The formula for general term of a geometric sequence is,

Where, first term:

We need to find the 10th term of this sequence. So, n = 10.

Next step is to plug in these values in the above formula to get the 10th term. Hence,

So, A is the correct choice.

they charge the same amount at 20 minutes.

step-by-step explanation: