Please answer the question fully:

6.7 For a brass alloy, the stress at which plastic deformation begins is 345MPa(50,000psi), and the modulus of elasticity is 103GPa(15.0106psi). (a) What is the maximum load that can be applied to a specimen with a cross-sectional area of 130mm2(0.2in2) without plastic deformation? (b) If the original specimen length is 76mm(3.0 in.), what is the maximum length to which it can be stretched without causing plastic deformation