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3 years ago

PLEASE HELP

Mathematics

2 answers:

andre [41]3 years ago

7 0

A. <span>isolating the x² term and finding the square root of both sides </span>

rjkz [21]3 years ago

3 0

The correct answer is A
Hope this helped :)

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Zach painted 92 square feet in the same amount of time that Blaise painted

Alika [10]

Answer:

The answer to your question is 252 in²

Step-by-step explanation:

Data

Zach = 92 ft²

Blaise = 13500 in²

Who painted more and how many more square inches? = ?

Process

1.- Convert the square feet to square inches

1 ft² ----------------- 144 in²

92 ft² ---------------- x

x = (92 x 144)/1

x = 13248 in²

2.- Subtract the lower value to the higher value

Area = 13500 in² - 13248 in²

Area = 252 in²

3.- Conclusion

Blaise painted 252 in² more than Zach.

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3 years ago

Mathew has $40.00, if Mathew wants to buy a bike for $70.00, how much more money will he need to buy the bike?

Gnoma [55]

Answer:

Step-by-step explanation:

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3 years ago

the dryers at Suds ‘R Us only accept quarters. Each quarter adds 8 minutes of dry time to the cycle. If Andrew knows that his to

svlad2 [7]

Answer:

it would be 2 quarters

Step-by-step explanation:

because 25cents=8minutes and 8+8 is 16 one over 15

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2 years ago

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and

egoroff_w [7]

Answer:

a) $P(140$

$P(0.036$

b) $P(140< \bar X$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Part a

Let X the random variable that represent the weights of a population, and for this case we know the distribution for X is given by:

$X \sim N(139,28.1)$

Where $\mu=139$ and $\sigma=28.1$

We are interested on this probability

$P(140$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(140$

And we can find this probability like this:

$P(0.036$

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.

$P(0.036$

Part b

For this case we select a sample size of n =32. Since the distribution for X is normal then the distribution for the sample mean $\bar X$ is given by: