Erica is given the diagram below and asked to prove that AB || DF. What would be the missing step of the proof?
Given: Point B is the midpoint of EF , and point A is the midpoint of ED.
Prove: AB || DF
E(X2, Y2)
B
(x, y) D
F(X3, Y)

4. a spring scale is constructed so that each 0.10-n increment is separated by 0.50 cm. what spring constant is necessary for the scale to be accurate? -1.0n/cm -0.10n/cm -9.8 n/cm -0.20n/cm

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?