Evaluate. (Be sure to check by differentiating!) ne J (214 + 8 ) 13 at t G . . . on Determine a change of variables from t to u. Choose the correct answer below. lar O A. u= t' +8 & R OB. u=13 ible O C. u = 2t * + 8 OD. U= 2t +8 se Write the integral in terms of u. uni 1 ( 21+ + 8) 13 at = J (D du (Type an exact answer. Use parentheses to clearly denote the argument of each function.) Evaluate the integral. (214 + 8) 13 at = ] (Tune an exact answer I Ice narentheces to clearly dennte the arniiment of each function )