Help please! Thank you

13/24 or 0.54166666666667

-8 5/24

Step-by-step explanation:

First you'll want a common denominator, so we go with 24, since both 6 & 8 can be multiplied to 24. For -5/6, times both by 4 to get -20/24. For -3/8, times both by 3 to get -9/24. Add those up, you get -29/24. So it isn't an improper fraction, simplify to -1 5/24. Add the whole numbers to that and you should get -8 5/24, and since we can't simplify, that's your final answer.

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