Achild is running on a moving sidewalk in an airport. when she runs against the sidewalk's motion, she travels 63ft in 9 seconds. when she runs with the sidewalk's motion, she travels 225ft in 15 seconds. what is the rate of the child on a still sidewalk and what is the rate of the moving sidewalk?

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?

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68