12.Practice.Tests.for.the.SAT_2015-2016_1128p

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12 Practice Tests for t h e SAT
Practice Test Four Answers and Explanations
Getting to the Answer:
Parabo l as are symmetric, so eac h h a l f of CD is 2. T h erefore,
t h e x-va l ue at point D is 2.
h But t h e functions a l so intersect
ere, so p l ug in x = 2 to eac h equation and set t h e resu l ts
equa l .
y=x2 + 2 = 22 + 2 = 6
y = - x2 + a= -(2)2 + a= -4 + a
6=-4+a
lO=a
16. B
Difficulty: Hig h
Strategic Advice: Last question! Take a deep breat h and
t h ink about w h at t h is description rea ll y means. A Venn
diagram mig h t be very h e l pfu l .
Getting to the Answer:
SetX
Set Y
x +b b y+ 2b
T intersection, w h ic h h as b e l ements, is s h own by
t h e over l ap of t h e two circ l es. T h e union is everyt h ing in
bot h circ l es. We want everyt h ing in t h e union, but not in
t h e intersection. T h is is (x + b) + (y + 2b) x = + y + 3b
e l ements.
SECTION 8
1. D
Difficulty: Low
It may be easier to start wit h t h e second bl an k and work
backward. Focus on t h e key words at t h e end of t h e
sentence: protection ... up to 75 years.
h e vaccine must
ave been described effective for a very l ong time. T h erefore, t h e
immunity by t h e first bl ank must h ave l aste d
l for a
ongtime.
T h e predictions must re l ate to t h e l ong amount of time t h e
vaccine was effective for; long works in t h e first bl an k and
was effective for is a good prediction for t h e second bl ank.
In (A), t h e first word is t h e opposite of t h e prediction.
Regarding t h e second word, protection from a vaccine does
not develop over time but may actua ll y dec l ine over time.
In (B), t h e first word is out of scope of t h e sentence. T h e
sentence is not discussing w h et h er t h e l eve l of immunity
was diverse, or different for various groups of peop l e. T h e
second word means collapsed and does not matc t h e
prediction. In (C), t h e sentence is not discussing w h et h er
peop l e experienced variable
l eve l s of immunity. A l so,
protection wou ld not decline up to a certain number of
years but wou ld decline for t h ose years. C h oice (D) is t h e
answer. In (E), t h e first word does not matc h t h e prediction,
and t h e second word is too extreme.
2. B
Difficulty: Low
Wou ld a committee be establ is h e d to increase or decrease
undesirable traffic impacts? E l iminate a ll answer c h oices
t h at do not matc h t h e prediction reduce.
In (A), h engage as severa l meanings, but none matc prediction. C h oice (B) is t h e correct answer. In (C),
h
t h e committee was establ is h d to reduce po ll ution and
congestion, not move t h em e l sew h ere. C h oice (D) is t h e
opposite of t h e prediction. In (E), if t h e committee was
establ is h e d to trivialize, or p l ay down, t h e importance of t h e
probl em, it wou ld not put effort into so l ving it by p l anning
t h e deve l opment of pedestrian pat h ways.
3. A
Difficulty: Medium
Since advisers are warning t h e member of Congress to
speak direct l y and inte ll igibl y, h e must not be speaking very
c l ear l y. If h is manner of speaking is unc l ear, it wou ld require
exp l anation or (A), elucidation. In (B), mystification wou
furt h er bewi ld er voters. In (C), ld
recitation, or speaking a l oud,
wou ld d o not h ing to c l ear up t h e speec h ; h e's a l ready doing
t h at. Alliteration, (D), and vocalization, (E), h ave not h ing to
do wit h c l arifying speec h for l isteners.
4. A
Difficulty: Medium
How mig h t you consider an action you t h oug h t extreme l y
reprehensible?