- 30 = 9

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• After 10 more experiments, the total becomes $ 40 + 10 = 50 $ experiments. The new success rate is 78%, so total successful experiments now are:
• \times 50 = 39
• Therefore, the number of successful experiments in the last 10 is:
• Thus, the answer is $ \boxed{9} $.
• Question: A science journalist analyzing a dataset finds that $ x + \frac{1}{x} = 4 $. What is the value of $ 5x^2 + \frac{5}{x^2} $?
• Solution: We are given $ x + \frac{1}{x} = 4 $. Square both sides:

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