The entrance to a tunnel is in the shape of a semiellipse over a 24 -ft by 8 -ft rectangular opening. The height at the center of the opening is 14 ft . a. Determine the height of the opening at a point 6 ft from the edge of the tunnel. Round to 1 decimal place. b. Can a 10 -ft high truck pass through the opening if the truck's outer wheel passes at a point 3 ft from the edge of the tunnel? c. Set up a coordinate system with the origin placed on the ground in the center of the roadway. Write a function that represents the height of the opening h x (in ft) as a function of the horizontal distance x (in ft) from the center.
The entrance to a tunnel is in the shape of a semiellipse over a 24 -ft by 8 -ft rectangular opening. The height at the center of the opening is 14 ft . a. Determine the height of the opening at a point 6 ft from the edge of the tunnel. Round to 1 decimal place. b. Can a 10 -ft high truck pass through the opening if the truck's outer wheel passes at a point 3 ft from the edge of the tunnel? c. Set up a coordinate system with the origin placed on the ground in the center of the roadway. Write a function that represents the height of the opening h x (in ft) as a function of the horizontal distance x (in ft) from the center.
The entrance to a tunnel is in the shape of a semiellipse over a
24
-ft
by
8
-ft
rectangular opening. The height at the center of the opening is
14
ft
.
a. Determine the height of the opening at a point
6
ft
from the edge of the tunnel. Round to
1
decimal place.
b. Can a
10
-ft
high truck pass through the opening if the truck's outer wheel passes at a point
3
ft
from the edge of the tunnel?
c. Set up a coordinate system with the origin placed on the ground in the center of the roadway. Write a function that represents the height of the opening
h
x
(in ft) as a function of the horizontal distance
x
(in ft) from the center.
System that uses coordinates to uniquely determine the position of points. The most common coordinate system is the Cartesian system, where points are given by distance along a horizontal x-axis and vertical y-axis from the origin. A polar coordinate system locates a point by its direction relative to a reference direction and its distance from a given point. In three dimensions, it leads to cylindrical and spherical coordinates.
Given lim x-4 f (x) = 1,limx-49 (x) = 10, and lim→-4 h (x) = -7 use the limit properties
to find lim→-4
1
[2h (x) — h(x) + 7 f(x)] :
-
h(x)+7f(x)
3
O DNE
17. Suppose we know that the graph below is the graph of a solution to dy/dt = f(t).
(a) How much of the slope field can
you sketch from this information?
[Hint: Note that the differential
equation depends only on t.]
(b) What can you say about the solu-
tion with y(0) = 2? (For example,
can you sketch the graph of this so-
lution?)
y(0) = 1
y
AN
(b) Find the (instantaneous) rate of change of y at x = 5.
In the previous part, we found the average rate of change for several intervals of decreasing size starting at x = 5. The instantaneous rate of
change of fat x = 5 is the limit of the average rate of change over the interval [x, x + h] as h approaches 0. This is given by the derivative in the
following limit.
lim
h→0
-
f(x + h) − f(x)
h
The first step to find this limit is to compute f(x + h). Recall that this means replacing the input variable x with the expression x + h in the rule
defining f.
f(x + h) = (x + h)² - 5(x+ h)
=
2xh+h2_
x² + 2xh + h² 5✔
-
5
)x - 5h
Step 4
-
The second step for finding the derivative of fat x is to find the difference f(x + h) − f(x).
-
f(x + h) f(x) =
= (x²
x² + 2xh + h² -
])-
=
2x
+ h² - 5h
])x-5h) - (x² - 5x)
=
]) (2x + h - 5)
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