Mrs. ronilo had her students make a stem-and-leaf plot of the heights of all of the students in the class. the mean was 55. dave was absent the day they did this, and he is 57 inches tall. how does adding him into the data change the measures of central tendency?

Find the value of the cosine for angle a

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base