Answer:
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Step-by-step explanation:
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Factor the polynomial completely.
Group and factor out the greatest common factor (GCF), then combine.
Graph the parabola using the direction, vertex, focus, and axis of symmetry.
Direction: Opens Up
So the answer is 
Hope this helps out :)
6a-4 = 3a+54
3a = 58
a = 58/3
a= 19.333
Answer:Alden is 13 years old
Step-by-step explanation
Let x represent Alden's age.
Let y represent the age of his sister.
Let z represent the age of his second sister.
His sister is 5 years older than he is and 3 times as old as his second sister. This means that
y = x + 5
y = 3z
Alden's brother is 4 years younger than his second sister. It means that his brother's age is
z - 4
His brother is 2. It means that
z - 4 = 2
z = 2 + 4 = 6
y = 3z
y = 3 × 6 = 18
Substituting y = 18 into y = x + 5, it becomes
18 = x + 5
x = 18 - 5 = 13
4 [ 5 (12 + 3) - 2 ] - 7
4 [ 5 (15) - 2 ] - 7
4 [ 75 - 2 ] - 7
4 [ 73 ] - 7
292 - 7
285