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

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Section 71<br />

Practice Test Four 357<br />

13. Suraj solved m physics problems on Monday, three<br />

times as many physics problems on Tuesday as on<br />

Monday, and three more than twice as many physics<br />

problems on Wednesday as on Monday. What is<br />

<strong>the</strong> average (arithmetic mean) number of physics<br />

problems he solved per day over <strong>the</strong> three days?<br />

(A) 6m + 1<br />

(B)<br />

10 m + 1<br />

3<br />

(C) 2m + 3<br />

(D) 2m + l<br />

(E) 2m - 1<br />

1 I<br />

14. If _ _c =(a+ bf', which of <strong>the</strong> following<br />

(a + b) 2<br />

must be true?<br />

(A) a= 0<br />

(B) Va+b = -1<br />

(C) Va+b = O<br />

(D) a+ b = 1<br />

(E) (a + b)2 = 0<br />

c<br />

y<br />

0<br />

y=x2 +2<br />

D<br />

y=-x2 + a<br />

15. The figure above shows <strong>the</strong> graphs of y = x2 + 2<br />

and y = -x2 + a <strong>for</strong> some constant a. If <strong>the</strong> length of<br />

CD is equal to 4, what is <strong>the</strong> value of a ?<br />

(A) 2<br />

(B) 4<br />

(C) 5<br />

(D) 8<br />

(E) 10<br />

16. Set X has x + 2b members, and set Y has y + 3b<br />

members. If <strong>the</strong>y have exactly b members in<br />

common, how many elements are in <strong>the</strong> union of<br />

X and Y but not in <strong>the</strong> intersection of X and Y?<br />

(A) x + y<br />

(B) x + y + 3b<br />

(C) x+y+4b<br />

(D) x + y + Sb<br />

(E) x + y + 6b<br />

x<br />

STOP

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