Answer:
x = 50
Step-by-step explanation:
When two secants intersect in the interior of a circle, the angles formed are the average of the arc an angle and its vertical intercept. In this case, our angle, 73, should be the average of x and 96. We can translate this to an equation and solve:

x + 96 = 146
x = 50
30:42 is represented as 30/42
The lowest form for that is 5/7. Hope that helped. Good luck
Cramer's Rule is a method that uses determinants to solve systems of equations that have the same number of equations as variables
Pretty sure that's right.