Please help! i’ll mark brainliest

B. 136

Step-by-step explanation:

∆ABC is similar to ∆EDC, therefore the ratio of their corresponding side lengths would be the same.

Thus:

AC/EC = AB/ED

(144 - x)/x = 51/3

(144 - x)/x = 17/1

Cross multiply

(144 - x)*1 = 17*x

144 - x = 17x

144 - x + x = 17x + x

144 = 18x

Divide both sides by 18

144/18 = 18x/18

8 = x

x = 8

✔️AC = 144 - x

Plug in the value of x

AC = 144 - 8

AC = 136

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.