I’m not sure tbh 
it was probably disabled because it not actually used on the blockchain, but it is useful to grasp the concept and you can play around with it on Bitcoin IDE.
For a simple case of multiplying something by 2 using addition like you demonstrated would suffice.
2 2 op_mul 3 3 op_mul op_add
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Here is my answer:
2 2 OP_MUL
3 3 OP_MUL
OP_ADD
It threw me off when the Bitcoin IDE displays 0 x D on the screen.
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haha sweet! happy days then
2 2 op_mul 3 3 op_mul op_add
Multiplication first then addition of the totals
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Loving the intro to Script! It’s very logical and has clear rules. Brilliant job of explaining, Filip!!
2 2 OP_MUL 3 3 OP_MUL OP_ADD
Stack Visualizer: 0xD
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Answer:
2 2 OP_MUL
3 3 OP_MUL
OP_ADD
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Answer:
2 2 OP_MUL
3 3 OP_MUL
OP_ADD
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The answer is:
2 2 OP_MUL
3 3 OP_MUL
OP_ADD
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2 2 op_mul
3 3 op_mul
op_add
First i had trouble figuring that D is actually 13. What the thing about D equals to words ? Is A = 10, B=11 …?
Yes, the IDE uses hex number format, it is explained in the later videos. 
Stack Programming Assignment:
2 2 op_mul
3 3 op_mul
op_add
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2 3 op_mul 1 7 op_mul op_add
am i wrong for writing it this way …
2 3 OP_MUL 1 7 OP_MUL OP_ADD (to get 13)?
This translates to (2 * 3) + (1 * 7). Try using BTC IDE to figure out the correct answer 
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Assignment answer:
2 2 op_mul 3 3 op_mul op_add
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