A circle with radius of 2cm sits inside a 7cm×11cm rectangle. What is the area of the shaded region? Round your final answer to
1 answer:
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1) Parallel line:
2) Rectangle
3) Perpendicular line:
4) x-coordinate: 2.7
5) Distance:
6) 3/8
7) Perimeter: 12.4 units
8) Area: 8 square units
9) Two slopes of triangle ABC are opposite reciprocals
10) Perpendicular line:
Step-by-step explanation:
1)
The equation of a line is in the form
where m is the slope and q is the y-intercept.
Two lines are parallel to each other if they have same slope m.
The line given in this problem is
So its slope is . Therefore, the only line parallel to this one is the line which have the same slope, which is:
Since it also has
2)
We can verify that this is a rectangle by checking that the two diagonals are congruent. We have:
- First diagonal:
- Second diagonal:
The diagonals are congruent, so this is a rectangle.
3)
Given points A (0,1) and B (-2,5), the slope of the line is:
The slope of a line perpendicular to AB is equal to the inverse reciprocal of the slope of AB, so:
And using the slope-intercept for,
Using the point we find:
And re-arranging,
4)
The endpoints of the segment are X(1,2) and Y(6,7).
We have to divide the sgment into 1/3 and 2/3 parts from X to Y, so for the x-coordinate we get:
5)
The distance between two points and
is given by
In this problem, the two points are
E(3,1)
F(4,7)
So the distance is given by
6)
We have:
A(3,4)
B(11,3)
Point C divides the segment into two parts with 3:5 ratio.
The distance between the x-coordinates of A and B is 8 units: this means that the x-coordinate of C falls 3 units to the right of the x-coordinate of A and 5 units to the left of the x-coordinate of B, so overall, the x-coordinate of C falls at
of the distance between A and B.
7)
To find the perimeter, we have to calculate the length of each side:
So the perimeter is
p = 3.6 + 3.2 + 2 + 3.6 = 12.4
8)
The area of a triangle is
For this triangle,
Base = XW
Height = YZ
We calculate the length of the base and of the height:
So the area is
9)
A triangle is a right triangle when there is one right angle. This means that two sides of the triangle are perpendicular to each other: however, two lines are perpendicular when their slopes are opposite reciprocals. Therefore, this means that the true statement is
"Two slopes of triangle ABC are opposite reciprocals"
10)
The initial line is
A line perpendicular to this one must have a slope which is the opposite reciprocal, so
Using the slope-intercept form,
And using the point
we find:
Learn more about parallel and perpendicular lines:
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Answer:
a)
b) We are uncertain
c) It will change significantly
Step-by-step explanation:
a) Since the variances are unknown, we use the t-test with 95% confidence interval, that is the significance level = 1-0.05 = 0.025.
Since we assume that the variances are equal, we use the pooled variance given as
,
where .
The mean difference .
The confidence interval is
b) With 95% confidence, we can say that it is possible that the gaskets from shift 2 are, on average, wider than the gaskets from shift 1, because the mean difference extends to the negative interval or that the gaskets from shift 1 are wider, because the confidence interval extends to the positive interval.
c) Increasing the sample sizes results in a smaller margin of error, which gives us a narrower confidence interval, thus giving us a good idea of what the true mean difference is.