20 points What is the total cost for the carpet install, including the cost of the carpet, the cost of labor, and the additional fee? Note: Express your answer as a decimal number and do not round

Asap 25 pts brainliest to right best/answer

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?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.