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It seems you have uploaded an image of a math worksheet covering patterns and sequences in Indonesian ("Pola Bilangan"). I will help you solve the questions step-by-step. Let's begin with the breakdown of the questions:

### 1. **Perhatikan gambar konfigurasi berikut ini:**
   This question shows a pattern of triangles, and the task is to analyze the pattern.

   **a. Tentukan banyaknya segitiga pada pola ke-10**  
   This question asks you to find the number of triangles in the 10th configuration.

   **b. Tentukan rumus suku ke-n (Un) konfigurasi dari pola tersebut**  
   Here, you need to find the general formula for the number of triangles in the nth configuration.

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### 2. **Diketahui barisan bilangan sebagai berikut: 1, 3, 6, 10, 15, 21, ...**
   These numbers represent a pattern that you need to analyze.

   **a. Apakah barisan bilangan tersebut di atas merupakan barisan bilangan aritmatika?**  
   You need to determine if this sequence is arithmetic or not.

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### 3. **Diketahui barisan bilangan 36, 33, 30, 27, ...**
   This sequence is decreasing by a constant amount.

   **a. Tentukan suku ke-12 barisan bilangan tersebut!**  
   **

A math worksheet covering patterns and sequences, including arithmetic and geometric sequences, and a problem involving the division of amoebas over time.

This worksheet covers essential topics in mathematics for Grades 7-9, including arithmetic and geometric sequences, pattern recognition, and exponential growth. It includes step-by-step solutions to problems involving sequence patterns and calculating sums and growth rates.

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