Find the image of the given point under the given translation! math problem !

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?

Find the required measurements of the following trapezoids. a = 8 cm b = 16 cm h = 10 cm

Evaluate the expression for the given value of the variable 7a - 4a for a =8