Which equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9?

a. x + 2y = 21

b.4x + 6y = 64

c.2x + y = 36

d.4x + y = 21

e.-3x + 4y = 33

f.3x + 2y = 28

1. the following set of data represents the number of waiting times in minutes from a random sample of 30 customers waiting for service at a department store. 4 5 7 10 11 11 12 12 13 15 15 17 17 17 17 17 18 20 20 21 22 22 23 24 25 27 27 31 31 32 a. determine the number of classes and class interval.

Which choice represents the sample space ,s for this event

The table shows the number of students who signed up for different after school activities. activity students cooking 9 chess 4 photography 8 robotics 11 select the true statements about the information in the table.