Update tools.py

tools.py

@@ -1 +1,60 @@
-#TODO
+def multiply(a: float, b: float) -> float:
+    """Multiply two numbers.
+    Args:
+        a: first float
+        b: second float
+
+    Returns:
+        Result float
+    """
+    return a * b
+
+def add(a: float, b: float) -> float:
+    """Add two numbers.
+    
+    Args:
+        a: first float
+        b: second float
+
+    Returns:
+        Result float
+    """
+    return a + b
+
+def subtract(a: float, b: float) -> float:
+    """Subtract two numbers.
+    
+    Args:
+        a: first float
+        b: second float
+
+    Returns:
+        Result float
+    """
+    return a - b
+
+def divide(a: float, b: float) -> float:
+    """Divide two numbers.
+    
+    Args:
+        a: first float
+        b: second float
+
+    Returns:
+        Result float
+    """
+    if b == 0:
+        raise ValueError("Cannot divide by zero.")
+    return a / b
+
+def modulus(a: float, b: float) -> float:
+    """Get the modulus of two numbers.
+    
+    Args:
+        a: first float
+        b: second float
+
+    Returns:
+        Result float
+    """
+    return a % b