7 Two square stepping stones are placed in a garden as shown below. Each stepping stone has a side length of 2 feet. The rest of the garden will have flowers in it.
4 ft.
6 ft.
How many square feet of the garden could contain flowers?
A 16 2
B 702
C24 fta
D32 ft2

Could somebody me with this radical simplification?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Find the missing dimension! need asap! tiny square is a =3025 in ²