Yes your answers are correct
W - width
l - length
p - perimeter
The perimeter is 72 cm (p=72).
The length is twice the width (l=2w).
The formula for perimeter is 2w+2l=P.

Check the answer:

The length of the photo is 24 cm, the width of the photo is 12 cm.
Answer:
for the number 13
Step-by-step explanation:

by Pythagoras theorem
x= √81+36
x= √117
punch square root of 117 with a calculator, I don't have one now
I considered them, but if you wanted them evaluated, here you go
24,000
630,000
96,000,000
Group the xs and the ys, 17+5= 22x 3+1=4y so y=4 and x=22.