We need the question and answer choices for us to answer
as AB || DE then
angle BAE = angle AED
so angle AED = 70
as AD = AE then
angle AED = angle ADE = 70
now in a triangle
angle DAE + Angle ADE + angle AED = 180
angle DAE + 70 + 70 = 180
angle DAE = 180 - 140 = 40
107° because a line is 180 degrees and 180 minus 73 is 107
Add up all the numbers & divide by the number of numbers. That should give you the mean.
