I suggest reading them over and over again to remember them. I know it sounds annoying, but trust me, it'll pay off.
Answer:

Step-by-step explanation:
+6x-5=0
we divide the coefficient of the X by half :
in this case: 6/2 = 3 , then we do the following
The result obtained is raised to square power: 3^2=9
we sum and subtract by 9 to maintain the balance of the equation:
+6x+9-9-5=0
we have:
-9-5=0
= 14
lets apply square root on both sides of the equation:

we know:

so we have:
abs(x+3)=
from where two solutions are obtained

finally we have:

There are many possible answers.
10:12
15:18
20:24
25:30
30:36
312* 17.5= 5460.00
134*19=2546
2546+5460= $8,006.00