It is 13 over 31 your welcome
Let slant height be s
Height = 38yd. = h
Side = 42yd. = a
S² = h² + (a/2)²
= 38² + 21²
= 1444 + 441
= 1885
S = √1885
S = 43.42yd.
Lateral area = 1/2 × 4a × s
= 2 × 42 × 43.42
= 3646.99
= 3647 yd.²
simplified is 
I got this by dividing both the numerator and denominator by 4
Hope this helps
-AaronWiseIsBae
I believe the answer is 64?