on a map, 3 inches represent an actual distance of 42 miles. If the actual distance between two cities is 322 miles, how many in
2 answers:
Answer:
Two cities are 23 inches apart on the map
Step-by-step explanation:
on a map, 3 inches represent an actual distance of 42 miles.
the actual distance between two cities is 322 miles
Let x be the inches apart on the map
Lets make a proportion
Cross multiply and solve for x
Divide both sides by 42
x= 23
Two cities are 23 inches apart on the map
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Answer: 3
Step-by-step explanation:
By the intersecting chords theorem,
Answer:
The correct answer B) The volumes are equal.
Step-by-step explanation:
The area of a disk of revolution at any x about the x- axis is πy² where y=2x. If we integrate this area on the given range of values of x from x=0 to x=1 , we will get the volume of revolution about the x-axis, which here equals,
which when evaluated gives 4pi/3.
Now we have to calculate the volume of revolution about the y-axis. For that we have to first see by drawing the diagram that the area of the CD like disk centered about the y-axis for any y, as we rotate the triangular area given in the question would be pi - pi*x². if we integrate this area over the range of value of y that is from y=0 to y=2 , we will obtain the volume of revolution about the y-axis, which is given by,
If we just evaluate the integral as usual we will get 4pi/3 again(In the second step i have just replaced x with y/2 as given by the equation of the line), which is the same answer we got for the volume of revolution about the x-axis. Which means that the answer B) is correct.