7. How many solutions are there for 5^2+7x-4=0
2 answers:
The equation 5^2+7x-4=0 has only one solution
<u>Solution:</u>
Given, equation is
We have to find the number of solution that the given equation can have.
Now let us solve the given equation to find the number of solutions it has.
So, take the equation
On squaring 5 we get 25
25 + 7x – 4 = 0
7x + 25 – 4 = 0
Adding 25 and -4 we get,
7x + 21 = 0
7x = - 21
x = - 3
Here we got only one value for "x"
Hence, the given equation has only one solution and that is x = – 3
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Using the normal distribution, it is found that 0.13% of American women CAN NOT use the bicycles designed by this company.
<h3>What is Normal Probability Distribution?</h3>The z-score of a measure X of a normally distributed variable with mean and standard deviation is given by:
- The z-score measures how many standard deviations the measure is above or below the mean.
- Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.
The mean and the standard deviation are given, respectively, by:
The proportion of women that cannot use the bikes(smaller than 54.5 inches) is the p-value of Z when X = 54.5, hence:
Z = -3
Z = -3 has a p-value of 0.0013.
0.0013 = 0.13% of American women CAN NOT use the bicycles designed by this company.
More can be learned about the normal distribution at brainly.com/question/27850813
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