Janelle wrote the matrix addition below. Which statement is true?
O (n+4)-7= 18
O (m- 1)+ 12) +0= 12
O ((s+1)- 18) + 11 =-28
O n+(m-1)+(s+ 1) =-28

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

a triangular prism is a 3 dimensional shape composed of triangles and rectangles. it is made from two triangular bases and three rectangular sides.  

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )