Answer:
(2*3)=6; 60= (2*3)*2*5 (prime factorization)
The numbers in the parenthesis can't be taken out because they are the HCF
So just move the 2 and the 5 on both sides and you'll get two pairs that are (6,30) and (12,30)
There is no information below to give an answer .
He buyed 240 cards because
20
x
12
-----
40
+
20
-------
240
The answer is 17040.34
Check the annuity due formula
By <span>(x + 5/x^2 + 9x + 20) you apparently meant the following:
x+5
----------------------
x^2 + 9x + 20
and by
</span><span>(x^2-16/x-4)
x^2-16
you apparently meant ---------------
x - 4
Please use additional parentheses for clarity.
Dividing,
</span> x+5 (x-4)(x+4)
---------------------- * ---------------
x^2 + 9x + 20 x-4
Now, x^2 + 9x + 20 factors into (x+4)(x+5), so what we have now is
(x+5)(x+4)
------------------------- = 1 This is true for all x, so there are no exclusions.
(x+4)(x+5)