There are 3 sides to a triangle. The first side is 12 cm. The second side is 20% longer than the first side. The third side is 21% shorter than the second side. How long is the third side?

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.

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Is the square root of 4 plus the square root of 16 rational?