If the domain of the square root function f(x) is x is less than or equal to 7 , which statement must be true?

The measure of the angle m<LKM is 156degrees

The point where two lines meet is called angle.

From the diagram shown:

m<LKN + m<NKM = m<LKM and:

m<LKN = m<NKM

Hence m<NKM + m<NKM = m<LKM

2m<NKM = m<LKM

2(3x+9) = 7x-5

6x+18 = 7x - 5

6x-7x = -5-18

-x = -23

x = 23

Get the angle m<LKM

m<LKM = 2m<NKM

m<LKM = 2 (3x+9)

m<LKM = 6x+18

m<LKM = 6(23) + 18

m<LKM =  138+18

m<LKM = 156degrees

Hence the measure of m<LKM is 156 degrees

Learn more here: link