Which expressions describe the area of the shaded region? select all that apply. a rectangle is divided into 12 columns and 6 rows, making 72 smaller rectangles. an area that includes 9 smaller rectangles and is the intersection of 3 of the 12 columns and 3 of the 6 rows is shaded. a. 3 12 × 3 6 312×36 b. 3 10 × 1 2 310×12 c. 1 4 × 1 2 14×12 d. 1 4 × 1 3 14×13 e. 4 12 × 3 6 412×36

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

noncoplanar points are points that do not lie on the same line.