Refer to the attachments...
It's 3.74 rounded up to 4 the reason why it is that answer is because the formula to a triangle's Hypotenuse is A squared + B squared = C squared
3/5 x 3/5
=9/25
You have to multiply the 2 numerators (top) and then the 2 denominators (bottom)
If the expression is: yⁿ
then y is the Base.
If the expression is: yn
then y is the product.