Solution: We have to find the Frequency and Relative frequency of the given data:
Frequency is the number of times a number occurs.
Relative Frequency is the number of times a number occurs divided by the total number of items.
Therefore, the frequency and relative frequency are calculated as below:
Number Frequency Relative Frequency
20 1 
21 4 
22 2 
23 4
24 3 
25 2 
26 3 
27 5 
28 3 
29 4 
Total 31
12-5i + -3 + 4i
you will put them in brackets
(12-(5*i)) + (-3 +4*i)
is equal to 9-i
Hope this Help!
a. Factorize the denominator:

Then we're looking for
such that


If
, then
; if
, then
. So we have

as required.
b. Same setup as in (a):

We want to find
such that

Quick aside: for the second term, since the denominator has degree 2, we should be looking for another constant
such that the numerator of the second term is
. We always want the polynomial in the numerator to have degree 1 less than the degree of the denominator. But we would end up determining
anyway.

If
, then
; if
, then
. Expanding everything on the right then gives

which tells us
and
; in both cases, we get
. Then

as required.
Answer:
6+3x
You remove the parentheses and multiply