Determined the unknown addend

Step-by-step explanation:

What you would need to do is take 9+14, and you would get 23, and you would want to change that to be negative, so you would get a negative answer. So now when you plug the -23 into the empty space it is -23+ 14= -9

555.99.

step-by-step explanation:

hope this

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk