Find the value of each variable. for each circle, the dot represents the center

We know that
The inscribed angle measures half of the arc it comprises.
Opposite angles in a cyclic quadrilateral add up to 180°

Part 1)
a=360-(128+134)> a=98°
b=a/2> b=98/2> 49°

the answer Part 1) is
a=98°
b=49°

Part 2)
92+d=180> d=180-92> d=88°
102+c=180> c=180-102> c=78°
140+a=102*2> a=204-140> a=64°
b+a=2*d> b+64=2*88> b=2*88-64> b=112°

the answer Part 2) is
a=64°
b=112°
c=78°
d=88°

Do the math. she originally had 50 dollars on her gift card and she had 12 dollars left on her gift card after she finished her shopping spree. if you subtract 50 minus 12 you get thirty eight dollars as your answer. so therefore, ciara spent 38 dollars total o