What's the value of x?​

An angle that measures between 90 and 180° is called a(,

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?

Great freights a local shipping company, bases its charges on the weight of the items being shipped. in addition to changing 0.40$ per pound, great freights also charges a one-time fee of 10$ to set up a customers account.