fix: replace .english.md extension with .md

curriculum/challenges/english/08-data-analysis-with-python/numpy/mathematics.md

@@ -0,0 +1,49 @@
+---
+id: 5e9a0a8e09c5df3cc3600ed8
+title: Mathematics
+challengeType: 11
+videoId: 7txegvyhtVk
+---
+
+## Description
+
+<section id='description'>
+</section>
+
+## Tests
+
+<section id='tests'>
+
+````yml
+question:
+  text: |
+    What is the value of `b` after running the following code?
+
+    ```py
+    import numpy as np
+
+    a = np.array(([1, 2, 3, 4, 5], [6, 7, 8, 9, 10]))
+    b = np.max(a, axis=1).sum()
+    ```
+
+  answers:
+    - |
+      ```py
+      10
+      ```
+    - |
+      ```py
+      7
+      ```
+    - |
+      ```py
+      5
+      ```
+    - |
+      ```py
+      15
+      ```
+  solution: 4
+````
+
+</section>