I need help please this test is timed

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.

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

7(x - 2) = 3(x + 4) solve the following equation. then enter your answer in the space provided using mixed number format.