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OverLord2011 [107]
3 years ago
8

What is the quadratic formula

Mathematics
2 answers:
vova2212 [387]3 years ago
6 0
X=-b plus or minus the square root of 4ac divided by 2a
Setler79 [48]3 years ago
3 0
Just to clarify, by + or - I mean <span>±</span>
x =  \frac{-b + or -  \sqrt{ b^{2}-4ac } }{2a}
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5 screwdrivers were sold each week for every 2 cordless drills. If 14 cordless drills were sold last week, how many screwdrivers
Sedaia [141]

Answer:

35!!

Step-by-step explanation:

It should be correct but if not please tell me!!

6 0
2 years ago
6. To predict the annual rice yield in pounds we use the equation y-hat = 859 + 5.76x1 + 3.82x2 where x1 represents the number o
zysi [14]
The yield is given by the regression equation
y = 859 + 5.76x₁ + 3.82x₂ 
where
x₁ = number of acres planted
x₂ = number of acres harvested

The goodness of fit is r² = 0.94.
This appears to a very good fit to the data because it is almost equal to 1.
To assess the goodness of fit in a statistical sense, it may also necessary to perform an F-test in a hypothesis test. This is not possible without having raw measured data.
For this problem, r²=0.94 may be considered to be a very good fit to the measured data.

Part a.
When x₁ = 3200 acres and x₂ = 3000 acres, obtain
y = 859 + 5.76*3200 + 3.82*3000
   = 30,751 pounds

Part b.
Without performing a hypothesis test or a residual plot, we can conclude that the predicted value is in very good agreement with the actual value.

Because we do not have raw measured data, we can neither plot the residuals nor perform a hypothesis test.

In general,
When r² = 1, the agreement is exact.
When r² = 0, there is absolutely no agreement.
A value of r² > 0.9 is considered good.


3 0
3 years ago
Lines m and n are parallel. What is
saul85 [17]
Uhmmm, what is what?
7 0
3 years ago
Read 2 more answers
What is the approximate volume of a cone if the radius is 10 in the heights at 12
mr_godi [17]
The answer should be
12ft^3
12cm^3
12yd^3
12in^3
7 0
3 years ago
Read 2 more answers
Based on the survey results from 300 selected students in the Burbank School District (BSD), the 98% confidence interval used to
Pavlova-9 [17]

Answer:

follows are the solution to this question:

Step-by-step explanation:

Please find the correct question in the attached file:

The formula for calculating the Confidence interval of proportion:

\to CI=\hat{p} \pm Z_{\frac{\alpha}{2}} \sqrt{\frac{\hat{p}(1-\hat{p})}{n}}\\\\\to  \hat{p}=\frac{\text{lower limit +upper limit}}{2}\\

      =\frac{0.48+0.60}{2}\\\\=\frac{1.08}{2}\\\\=0.54

The number of learners with access to working at home on a computer:

= 0.54 \times 300 \\\\=162

Lower limit =0.48

upper limit = 0.60

\to margin \ error = \frac{\text{upper limit - lower limit}}{2}\\

                          =\frac{0.60-0.48}{2}\\\\=\frac{0.12}{2}\\\\= 0.06

5 0
3 years ago
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