Math 131 Exam I Sample Questions Worksheet With Answer Key - Washington University Page 6
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2
3
4
5
6Solutions
131 Exam I "Sample Questions"
1. D
=
2. C
t
16. a)
y
( 2
75
)
b) 4,746,093,750
3. A
17. a) $ 42,005.74 b) 17.3 years
4. 0.5
18. stretched by a factor of 2 (longer), shifted 3
5. B
units right and 4 units up.
x
6. (1.373, 2.591) and (9.940, 981.970);
2
+
−
2
19.
2
xh
h
h
7. C
=
=
−
x
20.
f
(
x
)
e
and
g
(
x
)
3
x
2
8. B
≤ y
≤
21. a)
0
1 .
9
9 .
b) 12 hours c) 8.46 feet
9. B
22. 21.29 years
=
t
. 0
115
10.
Q
500
e
, about 15 days.
23. 5.65%
3000
=
=
=
2
24. 2004
11.
(
)
,
(
)
2
,
(
)
. 0
25
f
x
g
x
x
h
x
x
x
=
x
25. a)
y
( 2
. 0
707
)
< x
<
12. a) $35 b)
$
. 1
83
$
68
.
17
=
( −
2
8
b)
y
x
) 3
13. 4.88%
9
=
+
−
−
2
14. 13,305 years
1
c)
y
(
x
3
)(
x
) 1
(
x
) 5
6
=
−
+
π
=
−
+
15.
y
1
5 .
cos(
t
)
7
where y is depth in feet
d)
y
3
sin(
8
x
)
3
3
and t is time in hours.
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