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My name is Ann [436]
3 years ago
15

Select All the correct answers

Mathematics
1 answer:
IrinaK [193]3 years ago
3 0

Answer:

OPTION B - 25

Step-by-step explanation:

We know that:

$ (a^x)^y = a^{x . y} $

$ \frac{a^x}{a^y} = a^{x - y} $

$ a^x . a^y = a^{x + y} $

The given problem uses these results to arrive at the answer.

$ (5^2)^{-3} = 5^{2 . (-3)} = 5^{-6} $

Now, $ 5^{-6 + 4} = 5^{-2} $

Now, $ \frac{5^{-2}}{5^{-4}} = 5^{-2 -(-4)} = 5^{(-2 + 4)} = 5^2  $

⇒ 5² = 25.

∴ The answer is 25. (Option B)

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Answer:

After 1.87 seconds the skateboarder is 8 ft from the bottom of the hill.

Step-by-step explanation:

The quadratic function d = –2*x² + 15 models a skateboarder’s distance, in feet, from the bottom of a hill x seconds after the skateboarder starts moving down the hill.

You want to know after how many seconds the skater is 8 feet from the bottom of the hill. That is, with the distance being 8 feet, you want to calculate the time t. Replacing in the expression d by the value of 8 feet:

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