What is m∠cad?

20º

80º

100º

110º

**i will give brainliest to the best answered**

100°

Step-by-step explanation:

see attached as reference.

the exterior angle ∠CAD is the sum of its two remote interior angles ∠ACB and ∠CBA

∠CAD = 80 + 20 = 100°

ab will be equal to

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)