Please, help with this integral problem that deals with rectangles.?

Question

here is a link to the questions. http://barzilai.org/cr/triangle.html

I did the first four and i think they are right?

a) 1

b) 1/2

c) 1/8*4=1/2

d 15?

now how would you do e, 2a and 2b?

Answer 1

a) 1

b) 1/2

c) 1/4

d) 1/8

e) 1.5; 1.75; 2; yes; yes

the sequence is 1 + 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + ... = 2