2) Find the solution to the system represented by this matrix
2 2 3 1
2 1 2
2
4 1 1 5
A)
(-1,2,1)
B)
(-2,3,-1)
c)
(1,0,1)
D)
12, 4, 1)
3)
Solve:

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?