Given: e-midpoint of da
f - midpoint of db
e, f, c collinear, fc ≅ ef
prove: eabc is a parallelogram.

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

The distance between two cities is 368 miles. if the scale on the map is 1/4 inch=23 miles, what is the distance between the cities on the map?