Find the number of ways to listen to four cds from a selection of eight cds.

8C4=8!(8−4)!4!=70

This is equivalent to choosing 4 from an available 8 and is hence the combination

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,

b because it contains 40% of the possible results from the random list.  

0,1,2,3 v 4,5,6,7,8,9  

4 integers to 6 integers  

40% success vs 60% fail

step-by-step explanation: