diff --git a/mathgenerator/funcs/complex_to_polar.py b/mathgenerator/funcs/complex_to_polar.py
index 90fb72d..ad4798d 100644
--- a/mathgenerator/funcs/complex_to_polar.py
+++ b/mathgenerator/funcs/complex_to_polar.py
@@ -9,7 +9,7 @@ def complexToPolarFunc(minRealImaginaryNum=-20, maxRealImaginaryNum=20):
     r = round(math.hypot(a, b), 2)
     theta = round(math.atan2(b, a), 2)
     plr = str(r) + "exp(i" + str(theta) + ")"
-    problem = f"rexp(itheta) = "
+    problem = "rexp(itheta) = "
     solution = plr
     return problem, solution
 
diff --git a/mathgenerator/funcs/decimal_to_roman_numerals.py b/mathgenerator/funcs/decimal_to_roman_numerals.py
index ee66ff6..c2470dc 100644
--- a/mathgenerator/funcs/decimal_to_roman_numerals.py
+++ b/mathgenerator/funcs/decimal_to_roman_numerals.py
@@ -25,8 +25,7 @@ def decimalToRomanNumeralsFunc(maxDecimal=4000):
         elif last_value == 4:
             solution += (roman_dict[divisor] + roman_dict[divisor * 5])
         elif 5 <= last_value <= 8:
-            solution += (roman_dict[divisor * 5] + (roman_dict[divisor] *
-                                                    (last_value - 5)))
+            solution += (roman_dict[divisor * 5] + (roman_dict[divisor] * (last_value - 5)))
         elif last_value == 9:
             solution += (roman_dict[divisor] + roman_dict[divisor * 10])
         x = math.floor(x % divisor)
diff --git a/mathgenerator/funcs/nth_fibonacci_number.py b/mathgenerator/funcs/nth_fibonacci_number.py
index 3d28655..cfb7e8a 100644
--- a/mathgenerator/funcs/nth_fibonacci_number.py
+++ b/mathgenerator/funcs/nth_fibonacci_number.py
@@ -5,8 +5,7 @@ def nthFibonacciNumberFunc(maxN=100):
     golden_ratio = (1 + math.sqrt(5)) / 2
     n = random.randint(1, maxN)
     problem = f"What is the {n}th Fibonacci number?"
-    ans = round((math.pow(golden_ratio, n) - math.pow(-golden_ratio, -n)) /
-                (math.sqrt(5)))
+    ans = round((math.pow(golden_ratio, n) - math.pow(-golden_ratio, -n)) / (math.sqrt(5)))
     solution = f"{ans}"
     return problem, solution