The strains on the surface of an experimental device made of pure aluminum (E = 70 Gpa,

Question:

The strains on the surface of an experimental device made of pure aluminum (E = 70 Gpa, v = 0.33) and tested in a space shuttle were measured by means of strain gages. The gages were oriented as shown in the figure, and the measured strains were (a = 1100 ( 10-6, (b = 1496 ( 10-6, and (c = - 39.44 ( 10 ( 10 (-6, and (c = 1 - 39.44 ( 10 (- 6.
What is the stress (x in the x direction?