Answer:
-450
Step-by-step explanation:
Say the first number is x to get the idea.
The first 150 terms are 150x - 5 * 150
15x - 750
300 - 750 = -450
i think the answer is 8
bc the small one is 4 and the big one is 6
and the other one is 6 so it must be 8
x(x + 9-x) = 6^2
9x = 36
x = 4
Answer
c. 4
a c
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