Math 121 Final December 7, 2021
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Math 121 Final
December 7, 2021
1. (10 points)
(a) If you the inequality |2x + 1| < 5 in the form a < x < b, what are a and b?
(b) Find cos θ if cot θ =
2. (10 points)
, x4 一 1
(a) 北1 f (x) where f (x) =... x2 + x
.( 0
x 一1
x = 一1
^x + 1 一 2
北→3 x 一 3
3. (10 points)
(a) lim 3x3
(b) For the graph of f (x) below, find the following limits.
y
P
N
M
L
x
a b c d
i) lim f (x)
北→a −
ii) lim f (x)
iii) lim f (x)
北→b
iv) lim f (x)
北→c↓
v) lim f (x)
4. (10 points) Find f/ (x) for: (a) f (x) = x + x2 +x(1) +
(b) f (x) =
5. (10 points) Find f\ (x) for:
(a) f (x) = ^1 一 cos3 x
(b) f (x) = (arctan(2x))3
6. (10 points) Find the equation of the tangent line to the curve y = 一 x2 + 1
which is parallel to the line y + x = 4.
7. (10 points) Find for (a) y = (tan x)北
(b) y3 + x2y4 = 1 + 2x
8. (10 points) Miller is in a boat and Anna is trying to pull the boat to the dock. If Anna is 12 feet above the boat and can pull the rope at a rate of 10 feet per minute, how fast is the boat approaching the dock when it is 16 feet away.
12ft
9. (10 points) We know the following about f (x):
f (3) = 1 and f\ (x) =
(b) Find x1 if you were using Newton’s method to find where f (x) = 0, starting at x0 = 3.
10. Sketch a graph of a continuous function on the axis below that satisfies:
f\ (一2) = 0, f\ (0) = 0, f\ (2) = 0
f\ (x) > 0 if x < 一2 and 0 < x < 2
f\ (x) < 0 if 一2 < x < 0 and x > 2.
f\\ (x) > 0 if 一1 < x < 1 and f\\ (x) < 0 if x < 一1 and x > 1.
Label all critical points and inflection points.
11. A rectangle is inscribed in the region bounded by the curve y = 10 一 x2 and the lines y = 0 and x = 0 (shown below), such that one corner of the rectangle is positioned at the point (0, 0) and the opposite corner touches the graph. What are the dimensions of such a rectangle of largest area?
12. (10 points)
(a) Compute lim
(b) Compute lim (tan x 一 sec x)
北→ −
13. Consider the definite integral:
)13 (x2 + 1) dx
Which of the following Riemann sums gives the right end point approx- imation to the above integral, using four sub-intervals?
(i) ╱ 2 + + 5 + 、
(ii) ╱ + 4 + + 9、
(iii) ╱ + 5 + + 10、
(iv) ╱ 1 + + 4 + 、
(v) ╱ + 9 + + 16、
14. (10 points)
(a) Compute ) ╱x3 + cos x 一 e3北、 dx.
(b) Compute ) dx.
15. (10 points)
(a) Compute )0 1 ╱^4x5 +^5x4 、 dx
(b) Compute ╱)1北 dt\.
16. (10 points)
(a) Compute ) dx.
(b) Compute )-1(2) dx.
17. (10 points) Find the area enclosed by x = y2 + y 一 5 and x = 3y 一 2
18. (10 points) Find the volume of the solid with base a circle of radius 5 and cross sections perpendicular to the x-axis are squares.
19. (10 points) For the region bounded by y = e北 and y = 1, for 0 < x < 1
(a) Which of the following integrals is the volume if the region is re- volved about the x-axis?
(i) )0 1 2π(e北 一 1) dx
(ii) )0 1 π(e北 一 1)2 dx
(iii) )0 1 π(e2北 一 1)dx
(iv) )0 1 2πx(e北 一 1) dx
(v) )0 1 π 2 |e北 一 1) dx
(b) Which of the following integrals is the volume if the region is re- volved about the y-axis?
(i) )0 1 2π(e北 一 1) dx
(ii) )0 1 π(e北 一 1)2 dx
(iii) )0 1 π(e2北 一 1)dx
(iv) )0 1 2πx(e北 一 1) dx
(v) )0 1 π 2 |e北 一 1) dx
20. (10 points) A water tank has the shape of a truncated, pyramid, with base 5 meters by 5 meters and top 2 meters by 2 meters and 3 meters high, shown below, and is filled with water with density 9810 N/m3 . Find the work performed in pumping all water the top of the tank.
2022-12-11