The base and height of the triangular mainsail of a sailboat ate 1.5 times greater than the base and height of the boats triangular staysail.How many times greater is the area of the mainsail than the area of the staysail?

Remember that area always involves a length times a length.

The base of the mainsail is 1.5 times greater.
AND
The height of the mainsail is 1.5 times greater.

So the area of the mainsail is 1.5 times 1.5 greater.

1.5 • 1.5 = 2.25

The mainsail's area is 2.25 times greater than the smaller sail.