A 15 foot tree casts a shadow that is 8 feet long . What is the distance from the top of the tree to the end of the shadow

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.

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Solve the inequality and graph 6j - 7 < 5