MA 15900
EXAM
3
SPRING 2010
1
1. Solve the equation.
2
x
3
+
4
x
2
−
11
x
+
7
=
2
x
3
−
2
x
2
+
4
1)
x
=
−
3
4
,
−
5
3
2)
x
=
−
1
2
,
−
5
4
3)
x
=
−
2
5
,
−
1
2
4)
x
=
−
1
3
,
−
3
2
5)
x
=
1
3
,
3
2
6)
x
=
2
5
,
1
2
7)
x
=
1
2
,
5
4
8)
x
=
3
4
,
5
3
9) No solution exists
2. A block of steel on a level, frozen pond, is given an initial speed
V
. Even though the block of steel is
sliding on smooth ice, there will be a small friction force that will slow the block of steel until it
comes to a stop. Assume that the distance,
d
, the block travels is directly proportional to the
square of
V
. When
V
= 4 feet per second,
d
= 32 feet. Find the distance the block travels if the
initial speed is 10 feet per second.
1)
16 10
feet
2)
80
feet
3)
100
feet
4)
112
feet
5)
132
feet
6)
200
feet
7)
400
feet
8)
432
feet
9)
None of the above
3. How much money, invested at an interest rate of 8% per year compounded continuously, will amount
to $65,000 in 17 years? Round your answer to the nearest cent.
1)
$16,666.67
2)
$16,682.95
3)
$16,758.42
4)
$17,567.48
5)
$47,794.12
6)
$88,400.00
7)
$240,501.17
8)
$252,112.14
9)
$253,252.56

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