Multiple choice: select the best answerwhich of the following is equal to the expression below? (6^-7)^3a. (-1/6)^21b. (1/6)^21c. (1/6)^-21d. (-1/6)^-21

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 system of equations y= 3/2 - 1, -x+ y =-3

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.