The following Python code demonstrates how to perform element-wise addition of two arrays and scalar multiplication using NumPy:
import numpy as np
# Define two arrays
arr1 = np.array([1, 2, 3])
arr2 = np.array([4, 5, 6])
# Perform element-wise addition
result_addition = arr1 + arr2
print('Addition:', result_addition)
# Perform scalar multiplication
result_multiplication = arr1 * 2
print('Multiplication:', result_multiplication)