Can someone help me with this: How do you write an equation in standard form given the slope -1/2 and point (2,4)?

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

During how many months was the difference between the number of days with homework and with no homework greater than 6?

Tony has 7/8 of a candy bar he wants to split the bar into servings that are 3/10 of the bar how many servings can he make. step by step? ?