Its math multiple choice. please give me correct answer. explanation no neeeded

Question 3 Find the derivative of the function Not yet answered f(x) - (x+1) -v2x +4 Marked out of and calculate it at point x = 0. 1.00 Flag question Select one: O a. 2,75 O b. 2 D c. 2,25 O d. 2,5 Clear my choiceish (en Question 1 What method should be used to calculate this limit? Time left 1: Not yet answered x2 - 4x - 21 lim Marked out of x-7 x2 - 8x+7 1.00 Flag question Select one: O a. try to factor the numerator and / or denominator, and then reduce the fraction O b. the factor x to the highest degree should be written before the brackets in the numerator and denominator O c. use direct substitution O d. multiply the numerator and denominator by the conjugate of the numerator or denominator Question 2 Find the limit of a function Not yet answered 8x3 - 3x2 - 5 lim- Marked out of x-+0 4 - 3x - 2x2 1.00 P Flag question Select one: Oa. Ob. 2 O c. 0 O d. -4 5 64) ENG 9 X 25.0