How would the fraction 5/1-sqrt 3. Be written if it’s denominator is rationalized using difference of squares?

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

Question 10jur's car can travel 340 miles on 12 gallons. jack's car can travel 390 miles on16 gallons. which person has the best mileage (miles per gallon) and what istheir mileage?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)