Write the system of equations as a matrix equation AX
equals
=B, with A as the coefficient matrix of the system.

4 x
4x
plus
+
2 y
2y
minus
−
6 z
6z
equals
=
1
1
negative 6 x
−6x
minus
−
y
y
minus
−
z
z
equals
=
7
7
negative 4 x
−4x
plus
+
7 y
7y
plus
+
6 z
6z
equals
=
1
1

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π