Hello I need help with the following Problems. Please and thank you.

\f9 Use the definition of the definite integral to evaluate | (x2 - 3) dx. 0 b n n 9 2 9k O A. f ( x) dx = lim _(Xk ) AXK = lim - 3 n A-0k=1 nook = 1 b n n n 2 O B. f( x) dx = lim _ f(xk ) Axk = lim _ 9k -3 a A-0 k=1 nook = 1 b n n 9k 2 O c. f( x ) dx = lim Ef(Xk ) Axx= lim > -3 n a A-0k=1 n-ook = 1 b n n 2 n O D. f(x)dx = lim _f(Xk )AXk= lim - 3 9 9k a A-0 k=1 n-ook =1Use geometry to evaluate the following integral. CO 2x if 1 sx54 f(x)dx, where f(x) = 12 - 2x if 4