Step-by-step explanation:

Answer:
k = -12/77
Step-by-step explanation:
OG problem: k(3k−6)−7k(6k+10)=12
Step-by-step:
3k - 6k - 42k - 70k = 12
-3k - 42k - 70k = 12
-7k - 70k = 12
-77k = 12
k = -12/77
Answer:
$63
Step-by-step explanation:
30% of 90 is 27
90-27=63
Answer:
a is 5 so the perinmeter is 30