13.
two complementary angles are in the ratio of 4: 5. find the measure of the smaller angle.

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.

Which statements about these triangles is true

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.