Answer:
r=-3
Step-by-step explanation:
−18=9r+9
Step 2: Flip the equation.
9r+9=−18
Step 3: Subtract 9 from both sides.
9r+9−9=−18−9
9r=−27
Step 4: Divide both sides by 9.
9r /9 =-27/9
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f(n) = -34
n = 20
f(n) = -2(20) + 6
f(n)= -40 +6
Answer: A. 6
