Answer:
$18
Step-by-step explanation:
You save 25% 0f 72 (72x.25)
Remove unnecessary parenthesis.
-5k 3 - 6k +1 - 6k 2 + 5k (simplify each term) -15k - 6k + 1 - 12k +5k = -28k +1
Answer: 28k + 1