Answer:
12,000.
Explanation:
First term = 10(1) - 15 = -5
50th term = 10(50) - 15 = 485
Sum of 50 terms = (50/2)(-5 + 485)
= 25 * 480
= 12,000
485 bro just do it with calculator
10×n-15
10×50-15
485
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