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elixir [45]
3 years ago
5

Need help,will mark brainliest

Mathematics
1 answer:
Zanzabum3 years ago
8 0

Answer:

Exact Form:

w=−7+√82,−7−√82

Decimal Form:

w=2.05538513...,−16.05538513…

Step-by-step explanation:

Solve using the quadratic formula,or f(x) = ax^2 + bx + c

plug in the given numbers for a,b, and c

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There are 80 balloons used
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4 gallons per gift basket

Step-by-step explanation:

20 x 4 = 80

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3 years ago
Can someone help me ?
Alex Ar [27]
All you need to do is divide 2.25 by 2!

The answer is  1.125!

I hope this helps! :)


5 0
3 years ago
It took gigi 1 hour and 20 minutes to complete a bicycle race It took Johnny twice as long because he got a flat tire. How many
Brrunno [24]
180 minutes, also 2 hours and 40 minutes
8 0
3 years ago
The average breaking strength of a certain brand of steel cable is 2000 pounds, with a standard deviation of 100 pounds. A sampl
Westkost [7]

Answer:

1963.2 pounds (lbs.)

Step-by-step explanation:

Things to understand before solving:

  • - <u>Normal Probability Distribution</u>
  1. The z-score formula can be used to solve normal distribution problems. In a set with mean ц and standard deviation б, the z-score of a measure X is given by: Z=\frac{X-u}{a}

The Z-score reflects how far the measure deviates from the mean. After determining the Z-score, we examine the z-score table to determine the p-value associated with this z-score. This p-value represents the likelihood that the measure's value is less than X, or the percentile of X. Subtracting 1 from the p-value yields the likelihood that the measure's value is larger than X.

  • - <u>Central Limit Theorem</u>
  1. The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean ц and standard deviation б , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean ц  and standard deviation s=\frac{a}{\sqrt{n} }

As long as n is more than 30, the Central Limit Theorem may be applied to a skewed variable. A specific kind of steel cable has an average breaking strength of 2000 pounds, with a standard variation of 100 pounds.

This means, ц  = 2000 and б = 100.

A random sample of 20 cables is chosen and tested.

This means that n = 20, s=\frac{100}{\sqrt{120} } =22.361

Determine the sample mean that will exclude the top 95 percent of all size 20 samples drawn from the population.

This is the 100-95th percentile, or X when Z has a p-value of 0.05, or X when Z = -1.645. So Z=\frac{X-u}{a}

  • By the Central Limit Theorem

Z=\frac{X-u}{a} \\-1.645=\frac{X-2000}{22.361} \\X-2000=-1.645*22.361

X =1963.2

<h3>Answer:</h3>

The sample mean that will cut off the top 95% of all size 20 samples obtained from the population is 1963.2 pounds.

3 0
2 years ago
Evaluate the expression 4x² – 13y for x = 3 and y = 2.
irina [24]

Answer: 118

Step-by-step explanation: if x=4 then 4x3 to the 2nd power= 144. 13x2=26

144-26=118

3 0
2 years ago
Read 2 more answers
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