He has 420 cards. if you have 30 packs and 14 in each just 30*14
Answer: first option.
Step-by-step explanation:
Find the common difference d of the arithmetic sequence:

Then the formula for the 101st term is the shown below:

Where:

Substitute values into the formula. Therefore, you obtain:

Answer:
Area of trapeze= (B+b):2×h
Therefore : (7+10):2×4=34
Good luck!