Choose all of the transformations that are rigid

Ifurniture stores having a weekend sale and is offering 20% discount on patio chairs and table the sales tax on furniture is 6.25 using function composition how can you represent the total amount a that you would need to pay for this furniture that cost x dollars

Evaluate cos2θ for cosθ = square root of 3/2

What is the radical expression that is equivalent to the expression 27 1 over 5?