The diagram from problem 1 is missing. So I'll only answer problem 2.
Let x be the length of the unknown segment (labeled with a question mark)
If you add the parallel bases of any trapezoid, then divide by 2, you'll get the length of the midsegment.
So,
(base1+base2)/2 = midsegment
(x+2.92)/2 = 3.98
x+2.92 = 3.98*2 .... multiply both sides by 2
x+2.92 = 7.96
x = 7.96-2.92 ...... subtract 2.92 from both sides
x = 5.04
<h3>Answer: Choice A) 5.04</h3>