Gary has a collection of comic books. after selling 70% of his comic books, he has 42 comic books left. how many comic books did he start with?

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.

Solve the equation for x.3(6x - 1) = 12 i've tried doing the math and i can't find out what i'm doing wrong

Use circumcenter theorem to solve for the given values