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castortr0y [4]
3 years ago
10

We expect a car’s highway gas mileage to be related to its city gas mileage (in mpg). Data for all 1209 1209 vehicles in the gov

ernment’s 2016 Fuel Economy Guide give the regression line highway mpg = 7.903 + ( 0.993 × city mpg )
(a) What is the slope of this line? (Enter your answer rounded to three decimal places.)

slope:

What does the numerical value of the slope tell you?
Mathematics
1 answer:
Umnica [9.8K]3 years ago
7 0

Answer:

a. Slope=0.993

Step-by-step explanation:

The linear regression line can be represented as

y=a+bx

Where a is intercept and b is the slope of regression line.

The given regression line is

Highway mpg=7.903+0.993 city mpg.

Here, the intercept is 7.903 and the slope is 0.993.

The numerical value 0.993 of slope depicts that due to unit increase in city mpg the highway mpg increase by 0.993.

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x=3 and x= -2

Step-by-step explanation:

we could simplify it to x*2 + x -6 = 0

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3 years ago
I think I know this much so far for A (but I could be wrong):
Eduardwww [97]
Part A. You have the correct first and second derivative.

---------------------------------------------------------------------

Part B. You'll need to be more specific. What I would do is show how the quantity (-2x+1)^4 is always nonnegative. This is because x^4 = (x^2)^2 is always nonnegative. So (-2x+1)^4 >= 0. The coefficient -10a is either positive or negative depending on the value of 'a'. If a > 0, then -10a is negative. Making h ' (x) negative. So in this case, h(x) is monotonically decreasing always. On the flip side, if a < 0, then h ' (x) is monotonically increasing as h ' (x) is positive.

-------------------------------------------------------------

Part C. What this is saying is basically "if we change 'a' and/or 'b', then the extrema will NOT change". So is that the case? Let's find out

To find the relative extrema, aka local extrema, we plug in h ' (x) = 0
h  ' (x) = -10a(-2x+1)^4
0 = -10a(-2x+1)^4
so either
-10a = 0 or (-2x+1)^4 = 0
The first part is all we care about. Solving for 'a' gets us a = 0. 
But there's a problem. It's clearly stated that 'a' is nonzero. So in any other case, the value of 'a' doesn't lead to altering the path in terms of finding the extrema. We'll focus on solving (-2x+1)^4 = 0 for x. Also, the parameter b is nowhere to be found in h ' (x) so that's out as well. 
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3 years ago
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Question 9 - (3 marks available )
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Answer:

Step-by-step explanation:

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Which graph represents a geometric sequence? On a coordinate plane, 5 points are plotted. The points are (1, 1), (2, 3), (3, 5),
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Answer:

The points are (1, 1), (2, 3), (3, 5), (4, 7)

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