Represent the equation on a number line c-7=-12

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?