Answer:
w=7.5 and L=10.5
Step-by-step explanation:
write an equation from the question and your knowledge of perimeter so
2x + 2(x+3) = 36
solve that for x to get width
first distribute 2x+ 2x+6 =36
simplify like terms 4x+6=36
subtract 6 on both sides 4x=30
divide by 4 to get x=7.5 is the width
then add three for length to get 10.5
Hope this helps! :)