a carpet cleaner charges 63 clean for the first time and 50 for each additional room a customer does not want to spend more than 180 for having the carpets in his cleaned

Od. 130 degrees because if you add them together you get the 130

Iam not sure , but probably 750 or 7.5

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.