Which of these is a two-step equation?
A. X+ 9 = 21
B. x= 11+2
C.2x + 9 = 21
D. x/3 = 9

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Find the x-intercepts of the parabola withvertex (1,1) and y-intercept (0,-3).write your answer in this form: (x1,if necessary, round to the nearest hundredth.

Find the greatest common factor of the followig monomials 46g^2h and 34g^6h^6