need help please

5. Evaluate the following limits : (a) lim x2+5x+4 x--4 x2-5x+6 (b) lim x2-1 (8pts) X-- x2 -3x-4 6. Find 2 numbers whose difference is 152 and whose product is a minimum. (Write out the solution) ( 10pts) 7. Find fif f (x) = 2+ x3 + x6 (8pts) 8. Use L'Hospital Rule to evaluate : (a) lim t - 0 t 2 (b) lim x->0o x2 (12pts) 9. Find the local minimum and the local maximum values of the function f(x) = x3 - 3x2 +1 (12pts) 10. If 2x