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ASHA 777 [7]
3 years ago
6

2^(n-1) = 256 ? Please give me the answer​

Mathematics
1 answer:
klemol [59]3 years ago
7 0

Answer:

n = 9

Step-by-step explanation:

Note that

256 = 2^{8}, thus

2^{n-1} = 2^{8}

Since the bases on both sides are equal (2) equate the exponents

n - 1 = 8 ( add 1 to both sides )

n = 9

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A square has a perimeter of 4 cm. What is the length of each side?
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Step-by-step explanation:

Since the perimeter is 4 cm and all the sides of the square have the same length, each side must be 1 cm long.

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Mr. Carter’s car has an 18-gallon gas tank. How much money will he spend to fill up his tank if gas costs $2.35 per gallon?
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2 years ago
Here is a simple probability model for multiple-choice tests. Suppose that each student has probability p of correctly answering
Alla [95]

Answer:

a) The probability that Jodi scores 78% or lower on a 100-question test is 4%.

b) The probability that Jodi scores 78% or lower on a 250-question test is 0.023%.

Step-by-step explanation:

a) To approximate this distribution we have to calculate the mean and the standard distribution.

The mean is the proportion p=0.85.

The standard deviation can be calculates as:

\sigma=\sqrt{\frac{p(1-p)}{n} }= \sqrt{\frac{0.85*(1-0.85)}{100} }=0.04

To calculate the probability that Jodi scores 78% or less on a 100-question test, we first calculate the z-value:

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b) In this case, the number of questions is 250, so the standard deviation needs to be calculated again:

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To calculate the probability that Jodi scores 78% or less on a 250-question test, we first calculate the z-value:

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The probability that Jodi scores 78% or lower on a 250-question test is 0.023%.

6 0
3 years ago
For a ride on a rental scooter, John paid an $8 fee to start the scooter plus 6 cents per minute of the ride. The total bill for
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The linear equation is 8+0.06x=19.94 and John rode the scooter for 199 minutes.

Fee to start the scooter = $8.

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Learn more about linear equation here:

brainly.com/question/24794429?referrer=searchResults

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