Which of the following equations is written in standard form? a. 2.5x+3y=12 b. -10x-3y=1 c. 2x+3y=12 d. 5x+5y=10

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

Explain how you can use the associative property to evaluate (7x50)x4.

If you could answer these your a life saver