What are the ^ supposed to mean multiplecation?
Yes because 84+45 is 129 and 3(28+15) is 129
Let the time taken for the first pipe to fill the pool be x hours
time taken for second pipe to fill the pool is (x+7) hours
time taken for both pipes to fill the pull =(x-9) hours
thus fraction of time taken for both will be written as:
1/(x-9)
thus total fraction for pipe 1 and 2 will be
1/x+1/(x+7)=1/(x-9)
solving for x we get:
x=-3 or x=21
but time is positive, then time taken by first pipe is 21 hours
time taken by both pipes will be 21-9=12 hours
This linear system has one solution: (0,-1).
Step 1: y = 5x - 1
Step 2: 15x - 3(5x - 1) = 3
-15x - 15x + 3 = 3
-30x + 3 = 3
- 3 - 3
----------------------
-30x = 0
-------- ------
-30 -30
x = 0
Step 3: y = 5(0) -1
y = 0 - 1
y = -1
Multiply like such:
((a^2) -36) x 6 3 x (a^2) - 7a + 6
----------- and ----------
((a^2) -36) x (a^2) - 7a + 6 (a^2)-36 x (a^2) - 7a + 6
to get
6 3
--------------- x -----------
( a - 1 ) ( a - 6 ) ( a - 6 ) (a + 6 )
Which totals : (This is the answer)
18
--------------
( a - 6 )^2 ( a + 6 ) ( a - 1 )
I tried my best, if this isnt right sorry :P