Solve the following equations by determinants:
4x - 3y = 10; 3x - 3y = 7
a. 21 21
x = ÄÄ y = ÄÄ
51 2
b. 2
x = 5 y = ÄÄ
21
c. 31 2
x = ÄÄ y = - ÄÄ
21 21
d. 2
x = 3 y = Ä
3
e. 51 2
x = - ÄÄ y = ÄÄ
21 21
d. 2
x = 3 y = Ä
3
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Solve the problem.Four boys and three girls are seated, in a row, at random, to watch a play. What is the probability thata) a girl is seated at each end of the row?b) one of the boys is seated in the middle seat?c) boys and girls are seated alternately?
A. a) 
b) 
c) 
B. a) 
b) 
c) 
C. a) 
b) 
c) 
D. a) 
b) 
c) 
The function Y2 is defined as Y1 + k for some real number k. Based upon the given information about Y1 and Y2, find k.
A. 4 B. -2 C. -3 D. 5
Find the derivative of the function at the given value of x using a graphing utility. If necessary, round to four decimal places.f(x) = 4x cos x; x = 
Fill in the blank(s) with the appropriate word(s).
Find the exact value of the expression.sin 215° cos 95° - cos 215° sin 95°
A. - 
B. - 
C. - 
D. 