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QUESTION 20
The correct answer is 100.
Since
D
= 5
Ƥ
2, one can substitute 5
Ƥ
2 for
D
in 2
D
=
Ƥ
2
[ JLYLQJ
Ƥ
2 =
Ƥ
2
[ 6TXDULQJHDFKVLGHRI
Ƥ
2 =
Ƥ
2
[
gives
Ƥ
2)
2
= (
Ƥ
2
[
)
2
ZKLFKVLPSOLƮHVWR
2
(
Ƥ
2)
2
= (
Ƥ
2
[
)
2
, or
_
[
. This gives
[ 7RYHULI\VXEVWLWXWHIRU
[
and 5
Ƥ
2 for
_
D
in the equa
_
tion 2
D
_
=
Ƥ
2
[
_
, which yiel
_
ds 2(5
_
Ƥ
2) =
Ƥ
(
WKLVLVWUXH
since 2(5
Ƥ
2)
Ƥ
2 and
Ƥ
(
Ƥ
2
Ƥ
Ƥ
2.
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QUESTION 1
Choice B is correct.
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slope represents an interval over which the target
heart rate is strictly
increasing as time passes. A horizontal line segment represents an
interval over which there is no change in the target heart rate as
time passes, and a line segment with
a negative slope represents
an interval over which the target heart rate is strictly decreasing as
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consists of a line segment with a positive slope followed by a line
segment
with a negative slope, with no horizontal line segment in
between, indicating that the target heart rate is strictly increasing
then strictly decreasing.
Choice A is incorrect because the graph
over the interval between
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period in which there was no change in the target heart rate. Choice C
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65 minutes consists of a line segment with a negative slope followed
by a line
segment with a positive slope, indicating that the target heart
rate is strictly decreasing then strictly increasing. Choice D is incorrect
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contains horizontal line segments and
no segment with a negative
slope.
QUESTION 2
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