Q1.
Angle BAD is adjacent to angle CAD
which means they are equal
so angle BAD = 26 degrees
Q2.
Angel BAC = the sum of angles BAD and CAD
because they are adjacent angles
To find the angles we solve the equations
9x-5 = 3x+7
9x-3x = 7+5
6x = 12
x = 12/6
x = 6