Two Math Q from Prep, Please help me out

I am confusing the following two math questions from Prep Practice Test. If anyone know how to sovle them, please help me out. Many thanks.

1. The perimeter of a certain isosceles right triangle is 16 + 16*square root 2, what is the length of the hypotenuse of the triangle?

A. 8

B. 16

C. 4*square root 2

D. 8*square root 2

E. 16*square root 2

2. When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year?

A. 3/10

B. 2/5

C. 1/2

D. 2/3

E. 6/5

一：

1:  2*X^2=Y^2

2:  2X+Y=16+16*square root 2

SO:y=16 CHOOSE:B

二：

the height of the tree increase each year is x，so

(4+6x)=(1+1/5)(4+4x)

x=2/3  chooseD