GUYS HELP ME.. plEAS A street performer stands motionless on a column that measures 0.5 m by 0.5 m. If the performer weighs 900 N, what pressure does the performer exert on the pavement below?

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?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?