Solve for x. show each step of the solution. 4.5(4 − x ) + 36 = 202 − 2.5(3x + 28)

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

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?