90 square ft (try and look at it like each side is a 2d rectangle, find the areas of the sides and then add them up.)
Answer:
5x+6=3
Step-by-step explanation:
"A number" is a variable.
"Sum" is addition.
"Equals 3" is =3.
"and six" relates to "sum".
So when you put these together it would be 5x+6=3
