Atriangle has side lengths of (4x-10) units (2x+6) units and 5x units. which expression represents the perimeter of the triangle?

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.

Franco wants to double the volume of the cone. what should he do?

Math it's appreciated. (picture provided)