What is the height of the triangle with an area of 64 square feet and a base of 8 feet?

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?

Explain how you can use the associative property to evaluate (7x50)x4.

Which expression is rational? 6. , square root two, square root 14, square root 49