What is the answers to this math worksheet ?

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

20 points! plz now and fast plzz im so over do! which measure will you calculate how much the babies' weights vary, on average, from their mean weight? thirteen babies were born in a hospital on the same day. the weights of the babies (in pounds) were 5.5, 6.4, 5.8, 8.1, 9, 7.6, 8.2, 7.2, 8.8, 6.6, 5.4, 7.7, and 6.9. a. mode b. interquartile range c. range d. mean absolute deviation e. quartile

What’s 12x + 6.25y greater than or equal to 1500