Please answer ( btw question number 2 is the vocabulary)

The complex fraction and the fraction do not have the same decimal equivalent. 21/3/120/12 is a terminating decimal when converted and 7/9 is a repeating decimal when converted therefore they are not decimal equivalents.

a negative exponent is translated as follows:

so, we have

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