The matrices shows the number of dance students enrolled in each type of class for two different years.

enrollment 2008

ballet ballroom country

begineer 52 18 21

intermediate 64 10 6

advanced 33 9 15

enrollment 2009

ballet ballroom country

begineer 41 27 9

intermediate 67 15 17

advanced 48 11 6

which matrix shows the change in enrollment from 2008 to 2009?

a) 93 45 30

131 25 33

81 20 21

b) 11 9 12

3 5 11

15 2 9

c) -11 9 -12

3 5 11

15 2 -9

d) 11 -9 12

-3 -5 -11

-15 -2 9

the answer turned out to be c

Just tell me how to set up the equation.

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Right triangle abc has three sides with lengths ab= 119, bc = 169, ca= 120. find the value of cos c. hint: draw and label the triangle. the hypotenuse is always the longest.