Area of a rectangle: A=L(w)
Perimeter of a square: P=4(s)
Perimeter of a rectangle: P=2(L)+2(w)
variables on the right hand side with the numerical values given then to
evaluate the resulting expression to find the value or the variables o the left.
For example A=L w, L=3.8, w=1.5 so:
A = (3.8)(1.5) = 5.7
Now you try the others and if you have difficulties tell us what they are
and we will try to explain further.