Is x^2 -4x = =4x +7 a quadratic equation
1 answer:
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Answer:
Length: 11.95
Width: 9.95
Step-by-step explanation:
Hello, great question. These types are questions are the beginning steps for learning more advanced Algebraic Equations.
To begin solving this question we need to create a formula to then solve. According to the information given in the question we can create 2 formulas.
<u>Where:</u>
- P is the perimeter
- L is the length
- W is the width
Now we can replace L for the L in the P formula and solve for W, Like so....
Now that we have the value of W we can plug that into the L formula and find L
Finally, we can see that the value of the Length is 11.95 in and the Width is 9.95 in
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
Answer:
A) Two populations: American men and American women, as it estimated from the broad of the survey.
B) The proportion of men that sometimes do not drive safely while talking or texting on cell phone is 32%, and the proportion of women that sometimes do not drive safely while talking or texting on cell phone is 25%.
C) There is enough evidence to support the claim that the proportion of men and women who used their cell phone in an emergency differ significantly (P-value=0.014).
Step-by-step explanation:
A. We have two populations: American men and American women. This are the populations from which we want to infere the difference of means.
B. The estimation of the proportion is already shown in the question:
The proportion of men that sometimes do not drive safely while talking or texting on cell phone is 32%, and the proportion of women that sometimes do not drive safely while talking or texting on cell phone is 25%.
These are unbiased estimators of the populations proportions.
C. This is a hypothesis test for the difference between proportions.
The claim is that the proportion of men and women who used their cell phone in an emergency differ significantly.
Then, the null and alternative hypothesis are:
The significance level is 0.05.
The sample 1 (men), of size n1=643 has a proportion of p1=0.71.
The sample 2 (women), of size n2=643 has a proportion of p2=0.77.
The difference between proportions is (p1-p2)=-0.06.
The pooled proportion, needed to calculate the standard error, is:
The estimated standard error of the difference between means is computed using the formula:
Then, we can calculate the z-statistic as:
This test is a two-tailed test, so the P-value for this test is calculated as (using a z-table):
As the P-value (0.014) is smaller than the significance level (0.05), the effect is significant.
The null hypothesis is rejected.
There is enough evidence to support the claim that the proportion of men and women who used their cell phone in an emergency differ significantly.