What is CD??
A.7
B.10
C.13
D.21

13

Step-by-step explanation:

Is there more info to this problem? I'm assuming both triangles are congruent. If so then you can assume that BC = CD

If that's the case then set them equal to each other to solve for x then plug x back into the side for CD to get the value

6x-5 = 4x+1

2x = 6

x = 3

Plug into CD   4(3) +1

= 13

THIS IS ASSUMING  TRIANGLE     ABC = ADC

step-by-step explanation:

quartic functions has x = –1 and x = –2 as its only two real zeroes:

f(x) = a(x+2)(x+1)   a: real number