Answer:
4
Step-by-step explanation:
Answer:
ac + 4 = b
Step-by-step explanation:
Step 1: Write equation
a = (b - 4)/c
Step 2: Multiply both sides by <em>c</em>
ac = b - 4
Step 3: Add 4 on both sides
ac + 4 = b
Answer:
900°
Step-by-step explanation:
Sum of angles= 180(n-2)
Where n= number of sides of polygon.

Answer:
so it can have a better balence
Step-by-step explanation:
X = -3
Pull out the like terms: -7x - 21 = -7 × ( x + 3)
Solve: -7 = 0
Solve: x + 3 = 0
Subtract 3 from both sides of the equation
So, x = -3