Answer:
XY = 16 ft
Step-by-step explanation:
The mid segment DE is half the sum of the parallel bases, that is
= 20 ( multiply both sides by 2 to clear the fraction )
XY + WZ = 40
XY +
XY = 40 ( multiply through by 2 to clear the fraction )
2XY + 3XY = 80
5XY = 80 ( divide both sides by 5 )
XY = 16
Answer:
126
Step-by-step explanation:
Total number of apples = 9
Number of favourite Mathematics lecturers = 5
To find number of ways in which 9 (identical) apples can be given to your 5 favourite Mathematics lecturers, find 
Combination refer to selection of items such that order does not matter.
Use 
Put 

A vertex is the common point that two lines or rays diverge from.