What is the opposite of the opposite of -19 ? -19 19 91 -91

What are the first 4 terms in the multiplication pattern given by the formula 2×4n

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Me! i will mark brainliest! i don't get polynomials and all that other stuff. so this question is really hard. multiply and simplify.(x - 4) (x^2 – 5x – 6)show your