What is a40 for the arithmetic sequence presented in the table below?

n 8 12
an 60 48

hint: an = a1 + d(n − 1), where a1 is the first term and d is the common difference

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?

Solve the x in the equation x^2+14x+17=-96

What is the measure of angle afe? 79 81 91 99