A company famous for its nacho-flavored corn chips has developed two new formulas, A and B, which they hope their customers will
1 answer:
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Answer:
Option C) The average contents of all bottles of juice in the population, which is 473 mL
Step-by-step explanation:
We are given the following in the question:
Population mean, μ = 473 mL
Sample mean, = 472 mL
Sample size, n = 30
Sample standard deviation, σ = 0.2
First, we design the null and the alternate hypothesis
Representation of
is the population parameter that represents the population mean.
Thus, for the given situation represents:
Option C) The average contents of all bottles of juice in the population, which is 473 mL
Answer:
"The maximum number of solutions is one."
Step-by-step explanation:
Hopefully the drawing helps visualize the problem.
The circle has a radius of 9 because the vertex is 9 units above the center of the circle.
The circle the parabola intersect only once and cannot intercept more than once.
The solution is "The maximum number of solutions is one."
Let's see if we can find an algebraic way:
The equation for the circle given as we know from the problem without further analysis is so far .
The equation for the parabola without further analysis is .
We are going to plug into
for
.
To expand , I'm going to use the following formula:
.
.
So this is a quadratic in terms of
Let's put everything to one side.
Subtract on both sides.
Reorder in standard form in terms of x:
The discriminant of the left hand side will tell us how many solutions we will have to the equation in terms of .
The discriminant is .
If you compare our equation to , you should determine
The discriminant is
Multiply the (18a+1)^2 out using the formula I mentioned earlier which was:
Distribute the 4a^2 to the terms in the ( ) next to it:
We know that because the parabola is open up.
We know that because in order it to be a circle a radius has to exist.
So our discriminat is positive which means we have two solutions for .
But how many do we have for just .
We have to go further to see.
So the quadratic formula is:
We already have
This is t he solution for .
To find we must square root both sides.
So there is only that one real solution (it actually includes 2 because of the plus or minus outside) here for x since the other one is square root of a negative number.
That is,
means you have:
or
.
The second one is definitely includes a negative result in the square root.
18a+1 is positive since a is positive so -(18a+1) is negative
2a^2 is positive (a is not 0).
So you have (negative number-positive number)/positive which is a negative since the top is negative and you are dividing by a positive.
We have confirmed are max of one solution algebraically. (It is definitely not 3 solutions.)
If r=9, then there is one solution.
If r>9, then there is two solutions as this shows:
r=9 since our circle intersects the parabola at (0,9).
Also if (0,9) is intersection, then
which implies r=9.
Plugging in 9 for r we get:
The equations intersect at x=0. Plugging into we do get
.
After this confirmation it would be interesting to see what happens with assume algebraically the solution should be (0,9).
This means we should have got x=0.
A fraction is only 0 when it's top is 0.
Add 18a+1 on both sides:
Square both sides:
Subtract 36a and 1 on both sides:
Divide both sides by :
Square root both sides:
The radius is 9 as we stated earlier.
Let's go through the radius choices.
If the radius of the circle with center (0,0) is less than 9 then the circle wouldn't intersect the parabola. So It definitely couldn't be the last two choices.
