Answer: 
<u>Step-by-step explanation:</u>
When you subtract b/2a from both sides, you end up with the Quadratic Formula.
The top of “^” needs a number to solve it.
72 is the denominator because 24 multiplied by 3 is 72 and 18 multiplied by 4 is 72
12s - 20 < 50 - 3s - 25
12s - 20 < 25 - 3s
+3s. +3s
S cancels
15s - 20 < 25
+ 20. +20
15s < 45
/15. /15
S < or equal to 3
$1800 because you have to add eight + twelve + sixteen and multiply that by 50