What is the domain of f(x) = 5^x - 7?

Sara needs to take a taxi to get to the movies the taxi charges $4.00 for the first mile and then $2.75 for each mile after that if the total charge is $20.50 then how far was sara’s taxi ride to the movie

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b