Please just answer the questions

Question 21 (1 point) A spring has a natural length of 5 inches. If it takes 2 pounds of force to stretch the spring 6 inches from its natural length, then how much work is done in stretching the spring 3 inches from its natural length? D Question 24 (1 point) 13.5 in-Ibs Which one of the following is the best approach to O 1.5 in-Ibs find the indefinite integral sec z tan z dr O 0.33 in-Ibs O Power reducing formula 9 in-Ibs O Let u = tanz Question 22 (1 point] O Which one of the following is the derivative of Let u = Sec I f(z) = In(31?) Integration by-parts O f'(z) Question 25 |1 point O When using partial fractions to decompose f(2) = = 31 12 I(2 1)2 f (2) = 21n(32) which one of the following is the numerator associated with the fraction with a O denominator or I 21 1 7 Question 23 0 Which one of the following is the correct indefinite integral of of de 5 In5 Ic